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Finding the Fourth Proportional to 772.80, 1,066.56 and 758.40

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Solution

The fourth proportional to 772.80, 1,066.56 and 758.40 is: 1,046.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.80 : 1,066.56 = 758.40 : x
  2. Step 2: Convert to fraction form
    772.80/1,066.56 = 758.40/x
  3. Step 3: Cross multiply
    772.80x = 1,066.56 × 758.40
  4. Step 4: Simplify right side
    772.80x = 808,879.10
  5. Step 5: Solve for x
    x = 808,879.10/772.80
  6. Step 6: Final answer
    x = 1,046.69

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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.