Home / 20,718.26-31,077.40-12,400.70

Finding the Fourth Proportional to 20,718.26, 31,077.40 and 12,400.70

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Solution

The fourth proportional to 20,718.26, 31,077.40 and 12,400.70 is: 18,601.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.26 : 31,077.40 = 12,400.70 : x
  2. Step 2: Convert to fraction form
    20,718.26/31,077.40 = 12,400.70/x
  3. Step 3: Cross multiply
    20,718.26x = 31,077.40 × 12,400.70
  4. Step 4: Simplify right side
    20,718.26x = 385,381,514.18
  5. Step 5: Solve for x
    x = 385,381,514.18/20,718.26
  6. Step 6: Final answer
    x = 18,601.06

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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.