Home / 5,128.53-7,691.99-1,665.78

Finding the Fourth Proportional to 5,128.53, 7,691.99 and 1,665.78

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Solution

The fourth proportional to 5,128.53, 7,691.99 and 1,665.78 is: 2,498.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.53 : 7,691.99 = 1,665.78 : x
  2. Step 2: Convert to fraction form
    5,128.53/7,691.99 = 1,665.78/x
  3. Step 3: Cross multiply
    5,128.53x = 7,691.99 × 1,665.78
  4. Step 4: Simplify right side
    5,128.53x = 12,813,154.77
  5. Step 5: Solve for x
    x = 12,813,154.77/5,128.53
  6. Step 6: Final answer
    x = 2,498.41

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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.