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Finding the Fourth Proportional to 1,069.20, 1,475.28 and 773.88

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Solution

The fourth proportional to 1,069.20, 1,475.28 and 773.88 is: 1,067.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.20 : 1,475.28 = 773.88 : x
  2. Step 2: Convert to fraction form
    1,069.20/1,475.28 = 773.88/x
  3. Step 3: Cross multiply
    1,069.20x = 1,475.28 × 773.88
  4. Step 4: Simplify right side
    1,069.20x = 1,141,689.69
  5. Step 5: Solve for x
    x = 1,141,689.69/1,069.20
  6. Step 6: Final answer
    x = 1,067.80

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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.