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Finding the Fourth Proportional to 457.42, 631.08 and 317.50

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Solution

The fourth proportional to 457.42, 631.08 and 317.50 is: 438.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.42 : 631.08 = 317.50 : x
  2. Step 2: Convert to fraction form
    457.42/631.08 = 317.50/x
  3. Step 3: Cross multiply
    457.42x = 631.08 × 317.50
  4. Step 4: Simplify right side
    457.42x = 200,367.90
  5. Step 5: Solve for x
    x = 200,367.90/457.42
  6. Step 6: Final answer
    x = 438.04

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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.