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Finding the Fourth Proportional to 14,124.50, 21,186.75 and 4,890.50

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Solution

The fourth proportional to 14,124.50, 21,186.75 and 4,890.50 is: 7,335.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,124.50 : 21,186.75 = 4,890.50 : x
  2. Step 2: Convert to fraction form
    14,124.50/21,186.75 = 4,890.50/x
  3. Step 3: Cross multiply
    14,124.50x = 21,186.75 × 4,890.50
  4. Step 4: Simplify right side
    14,124.50x = 103,613,800.88
  5. Step 5: Solve for x
    x = 103,613,800.88/14,124.50
  6. Step 6: Final answer
    x = 7,335.75

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Double scale
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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.