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Finding the Fourth Proportional to 920.08, 1,379.68 and 371.80

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Solution

The fourth proportional to 920.08, 1,379.68 and 371.80 is: 557.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.08 : 1,379.68 = 371.80 : x
  2. Step 2: Convert to fraction form
    920.08/1,379.68 = 371.80/x
  3. Step 3: Cross multiply
    920.08x = 1,379.68 × 371.80
  4. Step 4: Simplify right side
    920.08x = 512,965.02
  5. Step 5: Solve for x
    x = 512,965.02/920.08
  6. Step 6: Final answer
    x = 557.52

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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.