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Finding the Fourth Proportional to 457.58, 631.68 and 310.58

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Solution

The fourth proportional to 457.58, 631.68 and 310.58 is: 428.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.58 : 631.68 = 310.58 : x
  2. Step 2: Convert to fraction form
    457.58/631.68 = 310.58/x
  3. Step 3: Cross multiply
    457.58x = 631.68 × 310.58
  4. Step 4: Simplify right side
    457.58x = 196,187.17
  5. Step 5: Solve for x
    x = 196,187.17/457.58
  6. Step 6: Final answer
    x = 428.75

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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.