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Finding the Fourth Proportional to 882.11, 1,217.72 and 661.79

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Solution

The fourth proportional to 882.11, 1,217.72 and 661.79 is: 913.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.11 : 1,217.72 = 661.79 : x
  2. Step 2: Convert to fraction form
    882.11/1,217.72 = 661.79/x
  3. Step 3: Cross multiply
    882.11x = 1,217.72 × 661.79
  4. Step 4: Simplify right side
    882.11x = 805,871.61
  5. Step 5: Solve for x
    x = 805,871.61/882.11
  6. Step 6: Final answer
    x = 913.57

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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.