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Finding the Fourth Proportional to 1,239.55, 1,710.44 and 742.12

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Solution

The fourth proportional to 1,239.55, 1,710.44 and 742.12 is: 1,024.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.55 : 1,710.44 = 742.12 : x
  2. Step 2: Convert to fraction form
    1,239.55/1,710.44 = 742.12/x
  3. Step 3: Cross multiply
    1,239.55x = 1,710.44 × 742.12
  4. Step 4: Simplify right side
    1,239.55x = 1,269,348.02
  5. Step 5: Solve for x
    x = 1,269,348.02/1,239.55
  6. Step 6: Final answer
    x = 1,024.04

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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.