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Finding the Fourth Proportional to 772.62, 1,066.22 and 423.30

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Solution

The fourth proportional to 772.62, 1,066.22 and 423.30 is: 584.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.62 : 1,066.22 = 423.30 : x
  2. Step 2: Convert to fraction form
    772.62/1,066.22 = 423.30/x
  3. Step 3: Cross multiply
    772.62x = 1,066.22 × 423.30
  4. Step 4: Simplify right side
    772.62x = 451,330.93
  5. Step 5: Solve for x
    x = 451,330.93/772.62
  6. Step 6: Final answer
    x = 584.16

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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.