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Finding the Fourth Proportional to 1,034.92, 1,428.81 and 681.40

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Solution

The fourth proportional to 1,034.92, 1,428.81 and 681.40 is: 940.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,034.92 : 1,428.81 = 681.40 : x
  2. Step 2: Convert to fraction form
    1,034.92/1,428.81 = 681.40/x
  3. Step 3: Cross multiply
    1,034.92x = 1,428.81 × 681.40
  4. Step 4: Simplify right side
    1,034.92x = 973,591.13
  5. Step 5: Solve for x
    x = 973,591.13/1,034.92
  6. Step 6: Final answer
    x = 940.74

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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.