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Finding the Fourth Proportional to 920.02, 1,380.19 and 371.90

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Solution

The fourth proportional to 920.02, 1,380.19 and 371.90 is: 557.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.02 : 1,380.19 = 371.90 : x
  2. Step 2: Convert to fraction form
    920.02/1,380.19 = 371.90/x
  3. Step 3: Cross multiply
    920.02x = 1,380.19 × 371.90
  4. Step 4: Simplify right side
    920.02x = 513,292.66
  5. Step 5: Solve for x
    x = 513,292.66/920.02
  6. Step 6: Final answer
    x = 557.91

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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.