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Finding the Fourth Proportional to 772.20, 1,064.88 and 461.52

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Solution

The fourth proportional to 772.20, 1,064.88 and 461.52 is: 636.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.20 : 1,064.88 = 461.52 : x
  2. Step 2: Convert to fraction form
    772.20/1,064.88 = 461.52/x
  3. Step 3: Cross multiply
    772.20x = 1,064.88 × 461.52
  4. Step 4: Simplify right side
    772.20x = 491,463.42
  5. Step 5: Solve for x
    x = 491,463.42/772.20
  6. Step 6: Final answer
    x = 636.45

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1.5x scale

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.