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Finding the Fourth Proportional to 920.59, 1,379.79 and 372.70

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Solution

The fourth proportional to 920.59, 1,379.79 and 372.70 is: 558.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.59 : 1,379.79 = 372.70 : x
  2. Step 2: Convert to fraction form
    920.59/1,379.79 = 372.70/x
  3. Step 3: Cross multiply
    920.59x = 1,379.79 × 372.70
  4. Step 4: Simplify right side
    920.59x = 514,247.73
  5. Step 5: Solve for x
    x = 514,247.73/920.59
  6. Step 6: Final answer
    x = 558.61

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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.