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Finding the Fourth Proportional to 1,240.13, 1,711.70 and 716.46

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Solution

The fourth proportional to 1,240.13, 1,711.70 and 716.46 is: 988.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.13 : 1,711.70 = 716.46 : x
  2. Step 2: Convert to fraction form
    1,240.13/1,711.70 = 716.46/x
  3. Step 3: Cross multiply
    1,240.13x = 1,711.70 × 716.46
  4. Step 4: Simplify right side
    1,240.13x = 1,226,361.00
  5. Step 5: Solve for x
    x = 1,226,361.00/1,240.13
  6. Step 6: Final answer
    x = 988.90

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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.