Home / 21,318.57-31,939.56-12,548.70

Finding the Fourth Proportional to 21,318.57, 31,939.56 and 12,548.70

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Solution

The fourth proportional to 21,318.57, 31,939.56 and 12,548.70 is: 18,800.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,318.57 : 31,939.56 = 12,548.70 : x
  2. Step 2: Convert to fraction form
    21,318.57/31,939.56 = 12,548.70/x
  3. Step 3: Cross multiply
    21,318.57x = 31,939.56 × 12,548.70
  4. Step 4: Simplify right side
    21,318.57x = 400,799,956.57
  5. Step 5: Solve for x
    x = 400,799,956.57/21,318.57
  6. Step 6: Final answer
    x = 18,800.51

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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.