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Finding the Fourth Proportional to 1,861.34, 2,791.50 and 545.38

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Solution

The fourth proportional to 1,861.34, 2,791.50 and 545.38 is: 817.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.34 : 2,791.50 = 545.38 : x
  2. Step 2: Convert to fraction form
    1,861.34/2,791.50 = 545.38/x
  3. Step 3: Cross multiply
    1,861.34x = 2,791.50 × 545.38
  4. Step 4: Simplify right side
    1,861.34x = 1,522,437.25
  5. Step 5: Solve for x
    x = 1,522,437.25/1,861.34
  6. Step 6: Final answer
    x = 817.92

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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.