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Finding the Fourth Proportional to 882.64, 1,218.12 and 661.17

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Solution

The fourth proportional to 882.64, 1,218.12 and 661.17 is: 912.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.64 : 1,218.12 = 661.17 : x
  2. Step 2: Convert to fraction form
    882.64/1,218.12 = 661.17/x
  3. Step 3: Cross multiply
    882.64x = 1,218.12 × 661.17
  4. Step 4: Simplify right side
    882.64x = 805,384.40
  5. Step 5: Solve for x
    x = 805,384.40/882.64
  6. Step 6: Final answer
    x = 912.47

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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.