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Finding the Fourth Proportional to 72,495.80, 108,711.30 and 28,107.80

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Solution

The fourth proportional to 72,495.80, 108,711.30 and 28,107.80 is: 42,149.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,495.80 : 108,711.30 = 28,107.80 : x
  2. Step 2: Convert to fraction form
    72,495.80/108,711.30 = 28,107.80/x
  3. Step 3: Cross multiply
    72,495.80x = 108,711.30 × 28,107.80
  4. Step 4: Simplify right side
    72,495.80x = 3,055,635,478.14
  5. Step 5: Solve for x
    x = 3,055,635,478.14/72,495.80
  6. Step 6: Final answer
    x = 42,149.14

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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.