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Finding the Fourth Proportional to 920.16, 1,381.20 and 676.80

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Solution

The fourth proportional to 920.16, 1,381.20 and 676.80 is: 1,015.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.16 : 1,381.20 = 676.80 : x
  2. Step 2: Convert to fraction form
    920.16/1,381.20 = 676.80/x
  3. Step 3: Cross multiply
    920.16x = 1,381.20 × 676.80
  4. Step 4: Simplify right side
    920.16x = 934,796.16
  5. Step 5: Solve for x
    x = 934,796.16/920.16
  6. Step 6: Final answer
    x = 1,015.91

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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.