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Finding the Fourth Proportional to 1,240.40, 1,711.73 and 680.87

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Solution

The fourth proportional to 1,240.40, 1,711.73 and 680.87 is: 939.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.40 : 1,711.73 = 680.87 : x
  2. Step 2: Convert to fraction form
    1,240.40/1,711.73 = 680.87/x
  3. Step 3: Cross multiply
    1,240.40x = 1,711.73 × 680.87
  4. Step 4: Simplify right side
    1,240.40x = 1,165,465.61
  5. Step 5: Solve for x
    x = 1,165,465.61/1,240.40
  6. Step 6: Final answer
    x = 939.59

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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.