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Finding the Fourth Proportional to 1,129.84, 1,559.20 and 681.66

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Solution

The fourth proportional to 1,129.84, 1,559.20 and 681.66 is: 940.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.84 : 1,559.20 = 681.66 : x
  2. Step 2: Convert to fraction form
    1,129.84/1,559.20 = 681.66/x
  3. Step 3: Cross multiply
    1,129.84x = 1,559.20 × 681.66
  4. Step 4: Simplify right side
    1,129.84x = 1,062,844.27
  5. Step 5: Solve for x
    x = 1,062,844.27/1,129.84
  6. Step 6: Final answer
    x = 940.70

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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.