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Finding the Fourth Proportional to 1,008.60, 1,391.90 and 742.38

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Solution

The fourth proportional to 1,008.60, 1,391.90 and 742.38 is: 1,024.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.60 : 1,391.90 = 742.38 : x
  2. Step 2: Convert to fraction form
    1,008.60/1,391.90 = 742.38/x
  3. Step 3: Cross multiply
    1,008.60x = 1,391.90 × 742.38
  4. Step 4: Simplify right side
    1,008.60x = 1,033,315.01
  5. Step 5: Solve for x
    x = 1,033,315.01/1,008.60
  6. Step 6: Final answer
    x = 1,024.50

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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.