Home / 20,268.10-30,402.15-7,121.80

Finding the Fourth Proportional to 20,268.10, 30,402.15 and 7,121.80

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Solution

The fourth proportional to 20,268.10, 30,402.15 and 7,121.80 is: 10,682.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,268.10 : 30,402.15 = 7,121.80 : x
  2. Step 2: Convert to fraction form
    20,268.10/30,402.15 = 7,121.80/x
  3. Step 3: Cross multiply
    20,268.10x = 30,402.15 × 7,121.80
  4. Step 4: Simplify right side
    20,268.10x = 216,518,031.87
  5. Step 5: Solve for x
    x = 216,518,031.87/20,268.10
  6. Step 6: Final answer
    x = 10,682.70

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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.