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Finding the Fourth Proportional to 885.84, 1,221.72 and 769.20

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Solution

The fourth proportional to 885.84, 1,221.72 and 769.20 is: 1,060.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.84 : 1,221.72 = 769.20 : x
  2. Step 2: Convert to fraction form
    885.84/1,221.72 = 769.20/x
  3. Step 3: Cross multiply
    885.84x = 1,221.72 × 769.20
  4. Step 4: Simplify right side
    885.84x = 939,747.02
  5. Step 5: Solve for x
    x = 939,747.02/885.84
  6. Step 6: Final answer
    x = 1,060.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.