Home / 20,772.86-31,159.35-5,981.85

Finding the Fourth Proportional to 20,772.86, 31,159.35 and 5,981.85

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Solution

The fourth proportional to 20,772.86, 31,159.35 and 5,981.85 is: 8,972.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.86 : 31,159.35 = 5,981.85 : x
  2. Step 2: Convert to fraction form
    20,772.86/31,159.35 = 5,981.85/x
  3. Step 3: Cross multiply
    20,772.86x = 31,159.35 × 5,981.85
  4. Step 4: Simplify right side
    20,772.86x = 186,390,557.80
  5. Step 5: Solve for x
    x = 186,390,557.80/20,772.86
  6. Step 6: Final answer
    x = 8,972.79

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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.