Home / 20,142.10-30,213.15-12,657.70

Finding the Fourth Proportional to 20,142.10, 30,213.15 and 12,657.70

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Solution

The fourth proportional to 20,142.10, 30,213.15 and 12,657.70 is: 18,986.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,142.10 : 30,213.15 = 12,657.70 : x
  2. Step 2: Convert to fraction form
    20,142.10/30,213.15 = 12,657.70/x
  3. Step 3: Cross multiply
    20,142.10x = 30,213.15 × 12,657.70
  4. Step 4: Simplify right side
    20,142.10x = 382,428,988.76
  5. Step 5: Solve for x
    x = 382,428,988.76/20,142.10
  6. Step 6: Final answer
    x = 18,986.55

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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.