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Finding the Fourth Proportional to 1,240.65, 1,712.07 and 681.11

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Solution

The fourth proportional to 1,240.65, 1,712.07 and 681.11 is: 939.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.65 : 1,712.07 = 681.11 : x
  2. Step 2: Convert to fraction form
    1,240.65/1,712.07 = 681.11/x
  3. Step 3: Cross multiply
    1,240.65x = 1,712.07 × 681.11
  4. Step 4: Simplify right side
    1,240.65x = 1,166,108.00
  5. Step 5: Solve for x
    x = 1,166,108.00/1,240.65
  6. Step 6: Final answer
    x = 939.92

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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.