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Finding the Fourth Proportional to 1,240.85, 1,712.42 and 681.34

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Solution

The fourth proportional to 1,240.85, 1,712.42 and 681.34 is: 940.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.85 : 1,712.42 = 681.34 : x
  2. Step 2: Convert to fraction form
    1,240.85/1,712.42 = 681.34/x
  3. Step 3: Cross multiply
    1,240.85x = 1,712.42 × 681.34
  4. Step 4: Simplify right side
    1,240.85x = 1,166,744.56
  5. Step 5: Solve for x
    x = 1,166,744.56/1,240.85
  6. Step 6: Final answer
    x = 940.28

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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.