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Finding the Fourth Proportional to 387,658.72, 581,487.62 and 121,439.97

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Solution

The fourth proportional to 387,658.72, 581,487.62 and 121,439.97 is: 182,159.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,658.72 : 581,487.62 = 121,439.97 : x
  2. Step 2: Convert to fraction form
    387,658.72/581,487.62 = 121,439.97/x
  3. Step 3: Cross multiply
    387,658.72x = 581,487.62 × 121,439.97
  4. Step 4: Simplify right side
    387,658.72x = 70,615,839,128.17
  5. Step 5: Solve for x
    x = 70,615,839,128.17/387,658.72
  6. Step 6: Final answer
    x = 182,159.81

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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.