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Finding the Fourth Proportional to 3,451.61, 5,175.87 and 985.87

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Solution

The fourth proportional to 3,451.61, 5,175.87 and 985.87 is: 1,478.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,451.61 : 5,175.87 = 985.87 : x
  2. Step 2: Convert to fraction form
    3,451.61/5,175.87 = 985.87/x
  3. Step 3: Cross multiply
    3,451.61x = 5,175.87 × 985.87
  4. Step 4: Simplify right side
    3,451.61x = 5,102,737.73
  5. Step 5: Solve for x
    x = 5,102,737.73/3,451.61
  6. Step 6: Final answer
    x = 1,478.36

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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.