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Finding the Fourth Proportional to 779.52, 1,073.60 and 775.20

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Solution

The fourth proportional to 779.52, 1,073.60 and 775.20 is: 1,067.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.52 : 1,073.60 = 775.20 : x
  2. Step 2: Convert to fraction form
    779.52/1,073.60 = 775.20/x
  3. Step 3: Cross multiply
    779.52x = 1,073.60 × 775.20
  4. Step 4: Simplify right side
    779.52x = 832,254.72
  5. Step 5: Solve for x
    x = 832,254.72/779.52
  6. Step 6: Final answer
    x = 1,067.65

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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.