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Finding the Fourth Proportional to 774.72, 1,065.96 and 634.32

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Solution

The fourth proportional to 774.72, 1,065.96 and 634.32 is: 872.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.72 : 1,065.96 = 634.32 : x
  2. Step 2: Convert to fraction form
    774.72/1,065.96 = 634.32/x
  3. Step 3: Cross multiply
    774.72x = 1,065.96 × 634.32
  4. Step 4: Simplify right side
    774.72x = 676,159.75
  5. Step 5: Solve for x
    x = 676,159.75/774.72
  6. Step 6: Final answer
    x = 872.78

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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.