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Finding the Fourth Proportional to 1,272.44, 1,908.84 and 542

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Solution

The fourth proportional to 1,272.44, 1,908.84 and 542 is: 813.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.44 : 1,908.84 = 542 : x
  2. Step 2: Convert to fraction form
    1,272.44/1,908.84 = 542/x
  3. Step 3: Cross multiply
    1,272.44x = 1,908.84 × 542
  4. Step 4: Simplify right side
    1,272.44x = 1,034,591.28
  5. Step 5: Solve for x
    x = 1,034,591.28/1,272.44
  6. Step 6: Final answer
    x = 813.08

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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.