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Finding the Fourth Proportional to 772.28, 1,064.76 and 630.80

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Solution

The fourth proportional to 772.28, 1,064.76 and 630.80 is: 869.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.28 : 1,064.76 = 630.80 : x
  2. Step 2: Convert to fraction form
    772.28/1,064.76 = 630.80/x
  3. Step 3: Cross multiply
    772.28x = 1,064.76 × 630.80
  4. Step 4: Simplify right side
    772.28x = 671,650.61
  5. Step 5: Solve for x
    x = 671,650.61/772.28
  6. Step 6: Final answer
    x = 869.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.