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Finding the Fourth Proportional to 1,034.70, 1,551.18 and 742.20

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Solution

The fourth proportional to 1,034.70, 1,551.18 and 742.20 is: 1,112.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,034.70 : 1,551.18 = 742.20 : x
  2. Step 2: Convert to fraction form
    1,034.70/1,551.18 = 742.20/x
  3. Step 3: Cross multiply
    1,034.70x = 1,551.18 × 742.20
  4. Step 4: Simplify right side
    1,034.70x = 1,151,285.80
  5. Step 5: Solve for x
    x = 1,151,285.80/1,034.70
  6. Step 6: Final answer
    x = 1,112.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.