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Finding the Fourth Proportional to 1,107.15, 1,661.75 and 876.71

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Solution

The fourth proportional to 1,107.15, 1,661.75 and 876.71 is: 1,315.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.15 : 1,661.75 = 876.71 : x
  2. Step 2: Convert to fraction form
    1,107.15/1,661.75 = 876.71/x
  3. Step 3: Cross multiply
    1,107.15x = 1,661.75 × 876.71
  4. Step 4: Simplify right side
    1,107.15x = 1,456,860.15
  5. Step 5: Solve for x
    x = 1,456,860.15/1,107.15
  6. Step 6: Final answer
    x = 1,315.87

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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.