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Finding the Fourth Proportional to 642.42, 962.96 and 317.12

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Solution

The fourth proportional to 642.42, 962.96 and 317.12 is: 475.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.42 : 962.96 = 317.12 : x
  2. Step 2: Convert to fraction form
    642.42/962.96 = 317.12/x
  3. Step 3: Cross multiply
    642.42x = 962.96 × 317.12
  4. Step 4: Simplify right side
    642.42x = 305,367.47
  5. Step 5: Solve for x
    x = 305,367.47/642.42
  6. Step 6: Final answer
    x = 475.34

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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.