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Finding the Fourth Proportional to 716.72, 1,065.71 and 687.56

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Solution

The fourth proportional to 716.72, 1,065.71 and 687.56 is: 1,022.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.72 : 1,065.71 = 687.56 : x
  2. Step 2: Convert to fraction form
    716.72/1,065.71 = 687.56/x
  3. Step 3: Cross multiply
    716.72x = 1,065.71 × 687.56
  4. Step 4: Simplify right side
    716.72x = 732,739.57
  5. Step 5: Solve for x
    x = 732,739.57/716.72
  6. Step 6: Final answer
    x = 1,022.35

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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.