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Finding the Fourth Proportional to 1,091.68, 1,637.61 and 655.90

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Solution

The fourth proportional to 1,091.68, 1,637.61 and 655.90 is: 983.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.68 : 1,637.61 = 655.90 : x
  2. Step 2: Convert to fraction form
    1,091.68/1,637.61 = 655.90/x
  3. Step 3: Cross multiply
    1,091.68x = 1,637.61 × 655.90
  4. Step 4: Simplify right side
    1,091.68x = 1,074,108.40
  5. Step 5: Solve for x
    x = 1,074,108.40/1,091.68
  6. Step 6: Final answer
    x = 983.90

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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.