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Finding the Fourth Proportional to 18,363.95, 25,342.16 and 9,980.45

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Solution

The fourth proportional to 18,363.95, 25,342.16 and 9,980.45 is: 13,772.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,363.95 : 25,342.16 = 9,980.45 : x
  2. Step 2: Convert to fraction form
    18,363.95/25,342.16 = 9,980.45/x
  3. Step 3: Cross multiply
    18,363.95x = 25,342.16 × 9,980.45
  4. Step 4: Simplify right side
    18,363.95x = 252,925,984.16
  5. Step 5: Solve for x
    x = 252,925,984.16/18,363.95
  6. Step 6: Final answer
    x = 13,772.97

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.