Home / 20,873.47-31,236.29-12,979.70

Finding the Fourth Proportional to 20,873.47, 31,236.29 and 12,979.70

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Solution

The fourth proportional to 20,873.47, 31,236.29 and 12,979.70 is: 19,423.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,873.47 : 31,236.29 = 12,979.70 : x
  2. Step 2: Convert to fraction form
    20,873.47/31,236.29 = 12,979.70/x
  3. Step 3: Cross multiply
    20,873.47x = 31,236.29 × 12,979.70
  4. Step 4: Simplify right side
    20,873.47x = 405,437,673.31
  5. Step 5: Solve for x
    x = 405,437,673.31/20,873.47
  6. Step 6: Final answer
    x = 19,423.59

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1.5x scale

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.