Home / 20,140.90-30,211.35-10,299.40

Finding the Fourth Proportional to 20,140.90, 30,211.35 and 10,299.40

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Solution

The fourth proportional to 20,140.90, 30,211.35 and 10,299.40 is: 15,449.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,140.90 : 30,211.35 = 10,299.40 : x
  2. Step 2: Convert to fraction form
    20,140.90/30,211.35 = 10,299.40/x
  3. Step 3: Cross multiply
    20,140.90x = 30,211.35 × 10,299.40
  4. Step 4: Simplify right side
    20,140.90x = 311,158,778.19
  5. Step 5: Solve for x
    x = 311,158,778.19/20,140.90
  6. Step 6: Final answer
    x = 15,449.10

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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.