Home / 21,118-31,680.24-15,318.40

Finding the Fourth Proportional to 21,118, 31,680.24 and 15,318.40

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Solution

The fourth proportional to 21,118, 31,680.24 and 15,318.40 is: 22,979.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118 : 31,680.24 = 15,318.40 : x
  2. Step 2: Convert to fraction form
    21,118/31,680.24 = 15,318.40/x
  3. Step 3: Cross multiply
    21,118x = 31,680.24 × 15,318.40
  4. Step 4: Simplify right side
    21,118x = 485,290,588.42
  5. Step 5: Solve for x
    x = 485,290,588.42/21,118
  6. Step 6: Final answer
    x = 22,979.95

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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.