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Finding the Fourth Proportional to 1,240.85, 1,712.40 and 681.33

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Solution

The fourth proportional to 1,240.85, 1,712.40 and 681.33 is: 940.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.85 : 1,712.40 = 681.33 : x
  2. Step 2: Convert to fraction form
    1,240.85/1,712.40 = 681.33/x
  3. Step 3: Cross multiply
    1,240.85x = 1,712.40 × 681.33
  4. Step 4: Simplify right side
    1,240.85x = 1,166,705.64
  5. Step 5: Solve for x
    x = 1,166,705.64/1,240.85
  6. Step 6: Final answer
    x = 940.25

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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.