Home / 20,515.48-30,743.70-12,719.80

Finding the Fourth Proportional to 20,515.48, 30,743.70 and 12,719.80

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Solution

The fourth proportional to 20,515.48, 30,743.70 and 12,719.80 is: 19,061.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.48 : 30,743.70 = 12,719.80 : x
  2. Step 2: Convert to fraction form
    20,515.48/30,743.70 = 12,719.80/x
  3. Step 3: Cross multiply
    20,515.48x = 30,743.70 × 12,719.80
  4. Step 4: Simplify right side
    20,515.48x = 391,053,715.26
  5. Step 5: Solve for x
    x = 391,053,715.26/20,515.48
  6. Step 6: Final answer
    x = 19,061.40

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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.