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Finding the Fourth Proportional to 649.27, 972.79 and 429.76

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Solution

The fourth proportional to 649.27, 972.79 and 429.76 is: 643.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.27 : 972.79 = 429.76 : x
  2. Step 2: Convert to fraction form
    649.27/972.79 = 429.76/x
  3. Step 3: Cross multiply
    649.27x = 972.79 × 429.76
  4. Step 4: Simplify right side
    649.27x = 418,066.23
  5. Step 5: Solve for x
    x = 418,066.23/649.27
  6. Step 6: Final answer
    x = 643.90

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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.