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Finding the Fourth Proportional to 649.56, 972.60 and 512.88

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Solution

The fourth proportional to 649.56, 972.60 and 512.88 is: 767.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.56 : 972.60 = 512.88 : x
  2. Step 2: Convert to fraction form
    649.56/972.60 = 512.88/x
  3. Step 3: Cross multiply
    649.56x = 972.60 × 512.88
  4. Step 4: Simplify right side
    649.56x = 498,827.09
  5. Step 5: Solve for x
    x = 498,827.09/649.56
  6. Step 6: Final answer
    x = 767.95

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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.