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Finding the Fourth Proportional to 1,389.97, 1,917.05 and 892.66

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Solution

The fourth proportional to 1,389.97, 1,917.05 and 892.66 is: 1,231.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.97 : 1,917.05 = 892.66 : x
  2. Step 2: Convert to fraction form
    1,389.97/1,917.05 = 892.66/x
  3. Step 3: Cross multiply
    1,389.97x = 1,917.05 × 892.66
  4. Step 4: Simplify right side
    1,389.97x = 1,711,273.85
  5. Step 5: Solve for x
    x = 1,711,273.85/1,389.97
  6. Step 6: Final answer
    x = 1,231.16

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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.