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Finding the Fourth Proportional to 387.91, 580.27 and 318.66

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Solution

The fourth proportional to 387.91, 580.27 and 318.66 is: 476.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.91 : 580.27 = 318.66 : x
  2. Step 2: Convert to fraction form
    387.91/580.27 = 318.66/x
  3. Step 3: Cross multiply
    387.91x = 580.27 × 318.66
  4. Step 4: Simplify right side
    387.91x = 184,908.84
  5. Step 5: Solve for x
    x = 184,908.84/387.91
  6. Step 6: Final answer
    x = 476.68

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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.