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Finding the Fourth Proportional to 72,359.80, 108,539.70 and 40,737.40

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Solution

The fourth proportional to 72,359.80, 108,539.70 and 40,737.40 is: 61,106.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,359.80 : 108,539.70 = 40,737.40 : x
  2. Step 2: Convert to fraction form
    72,359.80/108,539.70 = 40,737.40/x
  3. Step 3: Cross multiply
    72,359.80x = 108,539.70 × 40,737.40
  4. Step 4: Simplify right side
    72,359.80x = 4,421,625,174.78
  5. Step 5: Solve for x
    x = 4,421,625,174.78/72,359.80
  6. Step 6: Final answer
    x = 61,106.10

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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.