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Finding the Fourth Proportional to 1,240.80, 1,711.92 and 716.64

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Solution

The fourth proportional to 1,240.80, 1,711.92 and 716.64 is: 988.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.80 : 1,711.92 = 716.64 : x
  2. Step 2: Convert to fraction form
    1,240.80/1,711.92 = 716.64/x
  3. Step 3: Cross multiply
    1,240.80x = 1,711.92 × 716.64
  4. Step 4: Simplify right side
    1,240.80x = 1,226,830.35
  5. Step 5: Solve for x
    x = 1,226,830.35/1,240.80
  6. Step 6: Final answer
    x = 988.74

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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.