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Finding the Fourth Proportional to 72,363.78, 108,528.66 and 40,787.55

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Solution

The fourth proportional to 72,363.78, 108,528.66 and 40,787.55 is: 61,171.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,363.78 : 108,528.66 = 40,787.55 : x
  2. Step 2: Convert to fraction form
    72,363.78/108,528.66 = 40,787.55/x
  3. Step 3: Cross multiply
    72,363.78x = 108,528.66 × 40,787.55
  4. Step 4: Simplify right side
    72,363.78x = 4,426,618,146.18
  5. Step 5: Solve for x
    x = 4,426,618,146.18/72,363.78
  6. Step 6: Final answer
    x = 61,171.74

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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.