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Finding the Fourth Proportional to 1,091.90, 1,637.87 and 768.71

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Solution

The fourth proportional to 1,091.90, 1,637.87 and 768.71 is: 1,153.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.90 : 1,637.87 = 768.71 : x
  2. Step 2: Convert to fraction form
    1,091.90/1,637.87 = 768.71/x
  3. Step 3: Cross multiply
    1,091.90x = 1,637.87 × 768.71
  4. Step 4: Simplify right side
    1,091.90x = 1,259,047.30
  5. Step 5: Solve for x
    x = 1,259,047.30/1,091.90
  6. Step 6: Final answer
    x = 1,153.08

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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.