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Finding the Fourth Proportional to 920.18, 1,380.27 and 342.74

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Solution

The fourth proportional to 920.18, 1,380.27 and 342.74 is: 514.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.18 : 1,380.27 = 342.74 : x
  2. Step 2: Convert to fraction form
    920.18/1,380.27 = 342.74/x
  3. Step 3: Cross multiply
    920.18x = 1,380.27 × 342.74
  4. Step 4: Simplify right side
    920.18x = 473,073.74
  5. Step 5: Solve for x
    x = 473,073.74/920.18
  6. Step 6: Final answer
    x = 514.11

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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.