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Finding the Fourth Proportional to 1,125.71, 1,686.34 and 881.09

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Solution

The fourth proportional to 1,125.71, 1,686.34 and 881.09 is: 1,319.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.71 : 1,686.34 = 881.09 : x
  2. Step 2: Convert to fraction form
    1,125.71/1,686.34 = 881.09/x
  3. Step 3: Cross multiply
    1,125.71x = 1,686.34 × 881.09
  4. Step 4: Simplify right side
    1,125.71x = 1,485,817.31
  5. Step 5: Solve for x
    x = 1,485,817.31/1,125.71
  6. Step 6: Final answer
    x = 1,319.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.