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Finding the Fourth Proportional to 920.60, 1,380.90 and 867.80

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Solution

The fourth proportional to 920.60, 1,380.90 and 867.80 is: 1,301.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.60 : 1,380.90 = 867.80 : x
  2. Step 2: Convert to fraction form
    920.60/1,380.90 = 867.80/x
  3. Step 3: Cross multiply
    920.60x = 1,380.90 × 867.80
  4. Step 4: Simplify right side
    920.60x = 1,198,345.02
  5. Step 5: Solve for x
    x = 1,198,345.02/920.60
  6. Step 6: Final answer
    x = 1,301.70

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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.