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Finding the Fourth Proportional to 387.16, 580.66 and 127.15

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Solution

The fourth proportional to 387.16, 580.66 and 127.15 is: 190.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.16 : 580.66 = 127.15 : x
  2. Step 2: Convert to fraction form
    387.16/580.66 = 127.15/x
  3. Step 3: Cross multiply
    387.16x = 580.66 × 127.15
  4. Step 4: Simplify right side
    387.16x = 73,830.92
  5. Step 5: Solve for x
    x = 73,830.92/387.16
  6. Step 6: Final answer
    x = 190.70

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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.