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Finding the Fourth Proportional to 1,118.72, 1,678.89 and 542

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Solution

The fourth proportional to 1,118.72, 1,678.89 and 542 is: 813.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.72 : 1,678.89 = 542 : x
  2. Step 2: Convert to fraction form
    1,118.72/1,678.89 = 542/x
  3. Step 3: Cross multiply
    1,118.72x = 1,678.89 × 542
  4. Step 4: Simplify right side
    1,118.72x = 909,958.38
  5. Step 5: Solve for x
    x = 909,958.38/1,118.72
  6. Step 6: Final answer
    x = 813.39

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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.