Home / 21,072.39-31,624.13-9,979.05

Finding the Fourth Proportional to 21,072.39, 31,624.13 and 9,979.05

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Solution

The fourth proportional to 21,072.39, 31,624.13 and 9,979.05 is: 14,975.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,072.39 : 31,624.13 = 9,979.05 : x
  2. Step 2: Convert to fraction form
    21,072.39/31,624.13 = 9,979.05/x
  3. Step 3: Cross multiply
    21,072.39x = 31,624.13 × 9,979.05
  4. Step 4: Simplify right side
    21,072.39x = 315,578,918.01
  5. Step 5: Solve for x
    x = 315,578,918.01/21,072.39
  6. Step 6: Final answer
    x = 14,975.95

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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.