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Finding the Fourth Proportional to 1,691.10, 2,536.39 and 690.55

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Solution

The fourth proportional to 1,691.10, 2,536.39 and 690.55 is: 1,035.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691.10 : 2,536.39 = 690.55 : x
  2. Step 2: Convert to fraction form
    1,691.10/2,536.39 = 690.55/x
  3. Step 3: Cross multiply
    1,691.10x = 2,536.39 × 690.55
  4. Step 4: Simplify right side
    1,691.10x = 1,751,503.83
  5. Step 5: Solve for x
    x = 1,751,503.83/1,691.10
  6. Step 6: Final answer
    x = 1,035.72

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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.