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Finding the Fourth Proportional to 72,387.79, 108,432.23 and 53,688.94

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Solution

The fourth proportional to 72,387.79, 108,432.23 and 53,688.94 is: 80,422.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,387.79 : 108,432.23 = 53,688.94 : x
  2. Step 2: Convert to fraction form
    72,387.79/108,432.23 = 53,688.94/x
  3. Step 3: Cross multiply
    72,387.79x = 108,432.23 × 53,688.94
  4. Step 4: Simplify right side
    72,387.79x = 5,821,611,490.54
  5. Step 5: Solve for x
    x = 5,821,611,490.54/72,387.79
  6. Step 6: Final answer
    x = 80,422.56

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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.