Home / 21,318.76-31,979.42-8,839.71

Finding the Fourth Proportional to 21,318.76, 31,979.42 and 8,839.71

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Solution

The fourth proportional to 21,318.76, 31,979.42 and 8,839.71 is: 13,260.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,318.76 : 31,979.42 = 8,839.71 : x
  2. Step 2: Convert to fraction form
    21,318.76/31,979.42 = 8,839.71/x
  3. Step 3: Cross multiply
    21,318.76x = 31,979.42 × 8,839.71
  4. Step 4: Simplify right side
    21,318.76x = 282,688,798.77
  5. Step 5: Solve for x
    x = 282,688,798.77/21,318.76
  6. Step 6: Final answer
    x = 13,260.10

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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.