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Finding the Fourth Proportional to 920.11, 1,380.85 and 508.83

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Solution

The fourth proportional to 920.11, 1,380.85 and 508.83 is: 763.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.11 : 1,380.85 = 508.83 : x
  2. Step 2: Convert to fraction form
    920.11/1,380.85 = 508.83/x
  3. Step 3: Cross multiply
    920.11x = 1,380.85 × 508.83
  4. Step 4: Simplify right side
    920.11x = 702,619.22
  5. Step 5: Solve for x
    x = 702,619.22/920.11
  6. Step 6: Final answer
    x = 763.63

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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.