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Finding the Fourth Proportional to 882.62, 1,218.10 and 661.20

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Solution

The fourth proportional to 882.62, 1,218.10 and 661.20 is: 912.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.62 : 1,218.10 = 661.20 : x
  2. Step 2: Convert to fraction form
    882.62/1,218.10 = 661.20/x
  3. Step 3: Cross multiply
    882.62x = 1,218.10 × 661.20
  4. Step 4: Simplify right side
    882.62x = 805,407.72
  5. Step 5: Solve for x
    x = 805,407.72/882.62
  6. Step 6: Final answer
    x = 912.52

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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.