Home / 20,919.61-31,379.19-5,124.71

Finding the Fourth Proportional to 20,919.61, 31,379.19 and 5,124.71

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Solution

The fourth proportional to 20,919.61, 31,379.19 and 5,124.71 is: 7,687.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.61 : 31,379.19 = 5,124.71 : x
  2. Step 2: Convert to fraction form
    20,919.61/31,379.19 = 5,124.71/x
  3. Step 3: Cross multiply
    20,919.61x = 31,379.19 × 5,124.71
  4. Step 4: Simplify right side
    20,919.61x = 160,809,248.78
  5. Step 5: Solve for x
    x = 160,809,248.78/20,919.61
  6. Step 6: Final answer
    x = 7,687.01

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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.