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Finding the Fourth Proportional to 458.42, 687.39 and 314.18

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Solution

The fourth proportional to 458.42, 687.39 and 314.18 is: 471.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.42 : 687.39 = 314.18 : x
  2. Step 2: Convert to fraction form
    458.42/687.39 = 314.18/x
  3. Step 3: Cross multiply
    458.42x = 687.39 × 314.18
  4. Step 4: Simplify right side
    458.42x = 215,964.19
  5. Step 5: Solve for x
    x = 215,964.19/458.42
  6. Step 6: Final answer
    x = 471.11

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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.