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Finding the Fourth Proportional to 640.08, 961.96 and 615.76

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Solution

The fourth proportional to 640.08, 961.96 and 615.76 is: 925.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.08 : 961.96 = 615.76 : x
  2. Step 2: Convert to fraction form
    640.08/961.96 = 615.76/x
  3. Step 3: Cross multiply
    640.08x = 961.96 × 615.76
  4. Step 4: Simplify right side
    640.08x = 592,336.49
  5. Step 5: Solve for x
    x = 592,336.49/640.08
  6. Step 6: Final answer
    x = 925.41

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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.