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Finding the Fourth Proportional to 1,091.28, 1,637.16 and 321.78

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Solution

The fourth proportional to 1,091.28, 1,637.16 and 321.78 is: 482.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.28 : 1,637.16 = 321.78 : x
  2. Step 2: Convert to fraction form
    1,091.28/1,637.16 = 321.78/x
  3. Step 3: Cross multiply
    1,091.28x = 1,637.16 × 321.78
  4. Step 4: Simplify right side
    1,091.28x = 526,805.34
  5. Step 5: Solve for x
    x = 526,805.34/1,091.28
  6. Step 6: Final answer
    x = 482.74

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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.