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Finding the Fourth Proportional to 1,091.61, 1,638.26 and 398.94

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Solution

The fourth proportional to 1,091.61, 1,638.26 and 398.94 is: 598.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.61 : 1,638.26 = 398.94 : x
  2. Step 2: Convert to fraction form
    1,091.61/1,638.26 = 398.94/x
  3. Step 3: Cross multiply
    1,091.61x = 1,638.26 × 398.94
  4. Step 4: Simplify right side
    1,091.61x = 653,570.02
  5. Step 5: Solve for x
    x = 653,570.02/1,091.61
  6. Step 6: Final answer
    x = 598.72

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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.