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Finding the Fourth Proportional to 881.10, 1,215.72 and 686.07

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Solution

The fourth proportional to 881.10, 1,215.72 and 686.07 is: 946.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.10 : 1,215.72 = 686.07 : x
  2. Step 2: Convert to fraction form
    881.10/1,215.72 = 686.07/x
  3. Step 3: Cross multiply
    881.10x = 1,215.72 × 686.07
  4. Step 4: Simplify right side
    881.10x = 834,069.02
  5. Step 5: Solve for x
    x = 834,069.02/881.10
  6. Step 6: Final answer
    x = 946.62

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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.