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Finding the Fourth Proportional to 14,136.50, 21,204.75 and 7,980.50

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Solution

The fourth proportional to 14,136.50, 21,204.75 and 7,980.50 is: 11,970.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,136.50 : 21,204.75 = 7,980.50 : x
  2. Step 2: Convert to fraction form
    14,136.50/21,204.75 = 7,980.50/x
  3. Step 3: Cross multiply
    14,136.50x = 21,204.75 × 7,980.50
  4. Step 4: Simplify right side
    14,136.50x = 169,224,507.38
  5. Step 5: Solve for x
    x = 169,224,507.38/14,136.50
  6. Step 6: Final answer
    x = 11,970.75

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.