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Finding the Fourth Proportional to 1,119.55, 1,679.93 and 542.42

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Solution

The fourth proportional to 1,119.55, 1,679.93 and 542.42 is: 813.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.55 : 1,679.93 = 542.42 : x
  2. Step 2: Convert to fraction form
    1,119.55/1,679.93 = 542.42/x
  3. Step 3: Cross multiply
    1,119.55x = 1,679.93 × 542.42
  4. Step 4: Simplify right side
    1,119.55x = 911,227.63
  5. Step 5: Solve for x
    x = 911,227.63/1,119.55
  6. Step 6: Final answer
    x = 813.92

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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.