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Finding the Fourth Proportional to 1,240.87, 1,712.29 and 681.36

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Solution

The fourth proportional to 1,240.87, 1,712.29 and 681.36 is: 940.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.87 : 1,712.29 = 681.36 : x
  2. Step 2: Convert to fraction form
    1,240.87/1,712.29 = 681.36/x
  3. Step 3: Cross multiply
    1,240.87x = 1,712.29 × 681.36
  4. Step 4: Simplify right side
    1,240.87x = 1,166,688.70
  5. Step 5: Solve for x
    x = 1,166,688.70/1,240.87
  6. Step 6: Final answer
    x = 940.22

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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.