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Finding the Fourth Proportional to 387.30, 580.43 and 314.37

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Solution

The fourth proportional to 387.30, 580.43 and 314.37 is: 471.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.30 : 580.43 = 314.37 : x
  2. Step 2: Convert to fraction form
    387.30/580.43 = 314.37/x
  3. Step 3: Cross multiply
    387.30x = 580.43 × 314.37
  4. Step 4: Simplify right side
    387.30x = 182,468.21
  5. Step 5: Solve for x
    x = 182,468.21/387.30
  6. Step 6: Final answer
    x = 471.13

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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.