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Finding the Fourth Proportional to 772.68, 1,066.86 and 617.88

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Solution

The fourth proportional to 772.68, 1,066.86 and 617.88 is: 853.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.68 : 1,066.86 = 617.88 : x
  2. Step 2: Convert to fraction form
    772.68/1,066.86 = 617.88/x
  3. Step 3: Cross multiply
    772.68x = 1,066.86 × 617.88
  4. Step 4: Simplify right side
    772.68x = 659,191.46
  5. Step 5: Solve for x
    x = 659,191.46/772.68
  6. Step 6: Final answer
    x = 853.12

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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.