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Finding the Fourth Proportional to 1,091.61, 1,645.47 and 910.22

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Solution

The fourth proportional to 1,091.61, 1,645.47 and 910.22 is: 1,372.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.61 : 1,645.47 = 910.22 : x
  2. Step 2: Convert to fraction form
    1,091.61/1,645.47 = 910.22/x
  3. Step 3: Cross multiply
    1,091.61x = 1,645.47 × 910.22
  4. Step 4: Simplify right side
    1,091.61x = 1,497,731.48
  5. Step 5: Solve for x
    x = 1,497,731.48/1,091.61
  6. Step 6: Final answer
    x = 1,372.04

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.