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Finding the Fourth Proportional to 772.72, 1,066.21 and 457.90

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Solution

The fourth proportional to 772.72, 1,066.21 and 457.90 is: 631.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.72 : 1,066.21 = 457.90 : x
  2. Step 2: Convert to fraction form
    772.72/1,066.21 = 457.90/x
  3. Step 3: Cross multiply
    772.72x = 1,066.21 × 457.90
  4. Step 4: Simplify right side
    772.72x = 488,217.56
  5. Step 5: Solve for x
    x = 488,217.56/772.72
  6. Step 6: Final answer
    x = 631.82

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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.