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Finding the Fourth Proportional to 387.92, 581.88 and 127.91

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Solution

The fourth proportional to 387.92, 581.88 and 127.91 is: 191.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.92 : 581.88 = 127.91 : x
  2. Step 2: Convert to fraction form
    387.92/581.88 = 127.91/x
  3. Step 3: Cross multiply
    387.92x = 581.88 × 127.91
  4. Step 4: Simplify right side
    387.92x = 74,430.21
  5. Step 5: Solve for x
    x = 74,430.21/387.92
  6. Step 6: Final answer
    x = 191.87

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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.