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Finding the Fourth Proportional to 649.40, 972.48 and 613.76

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Solution

The fourth proportional to 649.40, 972.48 and 613.76 is: 919.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.40 : 972.48 = 613.76 : x
  2. Step 2: Convert to fraction form
    649.40/972.48 = 613.76/x
  3. Step 3: Cross multiply
    649.40x = 972.48 × 613.76
  4. Step 4: Simplify right side
    649.40x = 596,869.32
  5. Step 5: Solve for x
    x = 596,869.32/649.40
  6. Step 6: Final answer
    x = 919.11

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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.