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Finding the Fourth Proportional to 457.60, 631.66 and 310.72

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Solution

The fourth proportional to 457.60, 631.66 and 310.72 is: 428.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.60 : 631.66 = 310.72 : x
  2. Step 2: Convert to fraction form
    457.60/631.66 = 310.72/x
  3. Step 3: Cross multiply
    457.60x = 631.66 × 310.72
  4. Step 4: Simplify right side
    457.60x = 196,269.40
  5. Step 5: Solve for x
    x = 196,269.40/457.60
  6. Step 6: Final answer
    x = 428.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.