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Finding the Fourth Proportional to 1,277.03, 1,761.06 and 772.79

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Solution

The fourth proportional to 1,277.03, 1,761.06 and 772.79 is: 1,065.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.03 : 1,761.06 = 772.79 : x
  2. Step 2: Convert to fraction form
    1,277.03/1,761.06 = 772.79/x
  3. Step 3: Cross multiply
    1,277.03x = 1,761.06 × 772.79
  4. Step 4: Simplify right side
    1,277.03x = 1,360,920.75
  5. Step 5: Solve for x
    x = 1,360,920.75/1,277.03
  6. Step 6: Final answer
    x = 1,065.70

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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.