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Finding the Fourth Proportional to 72,502.80, 108,721.80 and 28,114.80

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Solution

The fourth proportional to 72,502.80, 108,721.80 and 28,114.80 is: 42,159.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,502.80 : 108,721.80 = 28,114.80 : x
  2. Step 2: Convert to fraction form
    72,502.80/108,721.80 = 28,114.80/x
  3. Step 3: Cross multiply
    72,502.80x = 108,721.80 × 28,114.80
  4. Step 4: Simplify right side
    72,502.80x = 3,056,691,662.64
  5. Step 5: Solve for x
    x = 3,056,691,662.64/72,502.80
  6. Step 6: Final answer
    x = 42,159.64

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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.