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Finding the Fourth Proportional to 18,411.32, 25,428.32 and 12,432.61

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Solution

The fourth proportional to 18,411.32, 25,428.32 and 12,432.61 is: 17,170.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,411.32 : 25,428.32 = 12,432.61 : x
  2. Step 2: Convert to fraction form
    18,411.32/25,428.32 = 12,432.61/x
  3. Step 3: Cross multiply
    18,411.32x = 25,428.32 × 12,432.61
  4. Step 4: Simplify right side
    18,411.32x = 316,140,355.14
  5. Step 5: Solve for x
    x = 316,140,355.14/18,411.32
  6. Step 6: Final answer
    x = 17,170.97

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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.