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Finding the Fourth Proportional to 1,145.97, 1,581.51 and 648.66

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Solution

The fourth proportional to 1,145.97, 1,581.51 and 648.66 is: 895.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.97 : 1,581.51 = 648.66 : x
  2. Step 2: Convert to fraction form
    1,145.97/1,581.51 = 648.66/x
  3. Step 3: Cross multiply
    1,145.97x = 1,581.51 × 648.66
  4. Step 4: Simplify right side
    1,145.97x = 1,025,862.28
  5. Step 5: Solve for x
    x = 1,025,862.28/1,145.97
  6. Step 6: Final answer
    x = 895.19

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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.