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Finding the Fourth Proportional to 72,307.87, 108,436.40 and 21,691.80

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Solution

The fourth proportional to 72,307.87, 108,436.40 and 21,691.80 is: 32,530.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,307.87 : 108,436.40 = 21,691.80 : x
  2. Step 2: Convert to fraction form
    72,307.87/108,436.40 = 21,691.80/x
  3. Step 3: Cross multiply
    72,307.87x = 108,436.40 × 21,691.80
  4. Step 4: Simplify right side
    72,307.87x = 2,352,180,701.52
  5. Step 5: Solve for x
    x = 2,352,180,701.52/72,307.87
  6. Step 6: Final answer
    x = 32,530.08

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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.