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Finding the Fourth Proportional to 78,487.16, 117,718.11 and 21,547.78

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Solution

The fourth proportional to 78,487.16, 117,718.11 and 21,547.78 is: 32,318.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,487.16 : 117,718.11 = 21,547.78 : x
  2. Step 2: Convert to fraction form
    78,487.16/117,718.11 = 21,547.78/x
  3. Step 3: Cross multiply
    78,487.16x = 117,718.11 × 21,547.78
  4. Step 4: Simplify right side
    78,487.16x = 2,536,563,936.30
  5. Step 5: Solve for x
    x = 2,536,563,936.30/78,487.16
  6. Step 6: Final answer
    x = 32,318.20

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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.