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Finding the Fourth Proportional to 649.30, 972.60 and 486.76

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Solution

The fourth proportional to 649.30, 972.60 and 486.76 is: 729.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.30 : 972.60 = 486.76 : x
  2. Step 2: Convert to fraction form
    649.30/972.60 = 486.76/x
  3. Step 3: Cross multiply
    649.30x = 972.60 × 486.76
  4. Step 4: Simplify right side
    649.30x = 473,422.78
  5. Step 5: Solve for x
    x = 473,422.78/649.30
  6. Step 6: Final answer
    x = 729.13

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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.