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Finding the Fourth Proportional to 781.97, 1,079.11 and 427.89

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Solution

The fourth proportional to 781.97, 1,079.11 and 427.89 is: 590.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.97 : 1,079.11 = 427.89 : x
  2. Step 2: Convert to fraction form
    781.97/1,079.11 = 427.89/x
  3. Step 3: Cross multiply
    781.97x = 1,079.11 × 427.89
  4. Step 4: Simplify right side
    781.97x = 461,740.38
  5. Step 5: Solve for x
    x = 461,740.38/781.97
  6. Step 6: Final answer
    x = 590.48

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Double scale
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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.