Home / 21,154.80-31,731.30-8,670.72

Finding the Fourth Proportional to 21,154.80, 31,731.30 and 8,670.72

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Solution

The fourth proportional to 21,154.80, 31,731.30 and 8,670.72 is: 13,005.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,154.80 : 31,731.30 = 8,670.72 : x
  2. Step 2: Convert to fraction form
    21,154.80/31,731.30 = 8,670.72/x
  3. Step 3: Cross multiply
    21,154.80x = 31,731.30 × 8,670.72
  4. Step 4: Simplify right side
    21,154.80x = 275,133,217.54
  5. Step 5: Solve for x
    x = 275,133,217.54/21,154.80
  6. Step 6: Final answer
    x = 13,005.71

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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.