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Finding the Fourth Proportional to 820.65, 1,131.98 and 634.17

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Solution

The fourth proportional to 820.65, 1,131.98 and 634.17 is: 874.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.65 : 1,131.98 = 634.17 : x
  2. Step 2: Convert to fraction form
    820.65/1,131.98 = 634.17/x
  3. Step 3: Cross multiply
    820.65x = 1,131.98 × 634.17
  4. Step 4: Simplify right side
    820.65x = 717,864.59
  5. Step 5: Solve for x
    x = 717,864.59/820.65
  6. Step 6: Final answer
    x = 874.75

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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.