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Finding the Fourth Proportional to 920.19, 1,377.65 and 861.99

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Solution

The fourth proportional to 920.19, 1,377.65 and 861.99 is: 1,290.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.19 : 1,377.65 = 861.99 : x
  2. Step 2: Convert to fraction form
    920.19/1,377.65 = 861.99/x
  3. Step 3: Cross multiply
    920.19x = 1,377.65 × 861.99
  4. Step 4: Simplify right side
    920.19x = 1,187,520.52
  5. Step 5: Solve for x
    x = 1,187,520.52/920.19
  6. Step 6: Final answer
    x = 1,290.52

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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.