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Finding the Fourth Proportional to 72,572.80, 108,856.74 and 28,209.52

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Solution

The fourth proportional to 72,572.80, 108,856.74 and 28,209.52 is: 42,313.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,572.80 : 108,856.74 = 28,209.52 : x
  2. Step 2: Convert to fraction form
    72,572.80/108,856.74 = 28,209.52/x
  3. Step 3: Cross multiply
    72,572.80x = 108,856.74 × 28,209.52
  4. Step 4: Simplify right side
    72,572.80x = 3,070,796,384.16
  5. Step 5: Solve for x
    x = 3,070,796,384.16/72,572.80
  6. Step 6: Final answer
    x = 42,313.32

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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.