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Finding the Fourth Proportional to 128,502.04, 177,333.18 and 71,909.08

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Solution

The fourth proportional to 128,502.04, 177,333.18 and 71,909.08 is: 99,234.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,502.04 : 177,333.18 = 71,909.08 : x
  2. Step 2: Convert to fraction form
    128,502.04/177,333.18 = 71,909.08/x
  3. Step 3: Cross multiply
    128,502.04x = 177,333.18 × 71,909.08
  4. Step 4: Simplify right side
    128,502.04x = 12,751,865,827.27
  5. Step 5: Solve for x
    x = 12,751,865,827.27/128,502.04
  6. Step 6: Final answer
    x = 99,234.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.