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Finding the Fourth Proportional to 920.88, 1,381.56 and 408.24

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Solution

The fourth proportional to 920.88, 1,381.56 and 408.24 is: 612.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.88 : 1,381.56 = 408.24 : x
  2. Step 2: Convert to fraction form
    920.88/1,381.56 = 408.24/x
  3. Step 3: Cross multiply
    920.88x = 1,381.56 × 408.24
  4. Step 4: Simplify right side
    920.88x = 564,008.05
  5. Step 5: Solve for x
    x = 564,008.05/920.88
  6. Step 6: Final answer
    x = 612.47

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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.