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Finding the Fourth Proportional to 20,398.52, 30,547.02 and 12,981.08

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Solution

The fourth proportional to 20,398.52, 30,547.02 and 12,981.08 is: 19,439.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,398.52 : 30,547.02 = 12,981.08 : x
  2. Step 2: Convert to fraction form
    20,398.52/30,547.02 = 12,981.08/x
  3. Step 3: Cross multiply
    20,398.52x = 30,547.02 × 12,981.08
  4. Step 4: Simplify right side
    20,398.52x = 396,533,310.38
  5. Step 5: Solve for x
    x = 396,533,310.38/20,398.52
  6. Step 6: Final answer
    x = 19,439.32

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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.