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Finding the Fourth Proportional to 920.33, 1,380.69 and 487.38

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Solution

The fourth proportional to 920.33, 1,380.69 and 487.38 is: 731.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.33 : 1,380.69 = 487.38 : x
  2. Step 2: Convert to fraction form
    920.33/1,380.69 = 487.38/x
  3. Step 3: Cross multiply
    920.33x = 1,380.69 × 487.38
  4. Step 4: Simplify right side
    920.33x = 672,920.69
  5. Step 5: Solve for x
    x = 672,920.69/920.33
  6. Step 6: Final answer
    x = 731.17

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1.5x scale

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.