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Finding the Fourth Proportional to 781.32, 1,166.24 and 716.40

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Solution

The fourth proportional to 781.32, 1,166.24 and 716.40 is: 1,069.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.32 : 1,166.24 = 716.40 : x
  2. Step 2: Convert to fraction form
    781.32/1,166.24 = 716.40/x
  3. Step 3: Cross multiply
    781.32x = 1,166.24 × 716.40
  4. Step 4: Simplify right side
    781.32x = 835,494.34
  5. Step 5: Solve for x
    x = 835,494.34/781.32
  6. Step 6: Final answer
    x = 1,069.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.