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Finding the Fourth Proportional to 803.17, 1,109.73 and 638.61

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Solution

The fourth proportional to 803.17, 1,109.73 and 638.61 is: 882.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.17 : 1,109.73 = 638.61 : x
  2. Step 2: Convert to fraction form
    803.17/1,109.73 = 638.61/x
  3. Step 3: Cross multiply
    803.17x = 1,109.73 × 638.61
  4. Step 4: Simplify right side
    803.17x = 708,684.68
  5. Step 5: Solve for x
    x = 708,684.68/803.17
  6. Step 6: Final answer
    x = 882.36

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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.