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Finding the Fourth Proportional to 1,191.42, 1,787.35 and 542.20

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Solution

The fourth proportional to 1,191.42, 1,787.35 and 542.20 is: 813.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.42 : 1,787.35 = 542.20 : x
  2. Step 2: Convert to fraction form
    1,191.42/1,787.35 = 542.20/x
  3. Step 3: Cross multiply
    1,191.42x = 1,787.35 × 542.20
  4. Step 4: Simplify right side
    1,191.42x = 969,101.17
  5. Step 5: Solve for x
    x = 969,101.17/1,191.42
  6. Step 6: Final answer
    x = 813.40

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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.