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Finding the Fourth Proportional to 639.20, 956.64 and 567.20

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Solution

The fourth proportional to 639.20, 956.64 and 567.20 is: 848.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.20 : 956.64 = 567.20 : x
  2. Step 2: Convert to fraction form
    639.20/956.64 = 567.20/x
  3. Step 3: Cross multiply
    639.20x = 956.64 × 567.20
  4. Step 4: Simplify right side
    639.20x = 542,606.21
  5. Step 5: Solve for x
    x = 542,606.21/639.20
  6. Step 6: Final answer
    x = 848.88

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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.