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Finding the Fourth Proportional to 387.12, 580.76 and 127.14

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Solution

The fourth proportional to 387.12, 580.76 and 127.14 is: 190.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.12 : 580.76 = 127.14 : x
  2. Step 2: Convert to fraction form
    387.12/580.76 = 127.14/x
  3. Step 3: Cross multiply
    387.12x = 580.76 × 127.14
  4. Step 4: Simplify right side
    387.12x = 73,837.83
  5. Step 5: Solve for x
    x = 73,837.83/387.12
  6. Step 6: Final answer
    x = 190.74

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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.