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Finding the Fourth Proportional to 1,266.38, 1,747.55 and 742.40

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Solution

The fourth proportional to 1,266.38, 1,747.55 and 742.40 is: 1,024.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.38 : 1,747.55 = 742.40 : x
  2. Step 2: Convert to fraction form
    1,266.38/1,747.55 = 742.40/x
  3. Step 3: Cross multiply
    1,266.38x = 1,747.55 × 742.40
  4. Step 4: Simplify right side
    1,266.38x = 1,297,368.67
  5. Step 5: Solve for x
    x = 1,297,368.67/1,266.38
  6. Step 6: Final answer
    x = 1,024.47

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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.