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Finding the Fourth Proportional to 781.14, 1,080.07 and 711.25

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Solution

The fourth proportional to 781.14, 1,080.07 and 711.25 is: 983.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.14 : 1,080.07 = 711.25 : x
  2. Step 2: Convert to fraction form
    781.14/1,080.07 = 711.25/x
  3. Step 3: Cross multiply
    781.14x = 1,080.07 × 711.25
  4. Step 4: Simplify right side
    781.14x = 768,195.31
  5. Step 5: Solve for x
    x = 768,195.31/781.14
  6. Step 6: Final answer
    x = 983.42

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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.