Home / 20,109.76-30,115.40-10,253.68

Finding the Fourth Proportional to 20,109.76, 30,115.40 and 10,253.68

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Solution

The fourth proportional to 20,109.76, 30,115.40 and 10,253.68 is: 15,355.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,109.76 : 30,115.40 = 10,253.68 : x
  2. Step 2: Convert to fraction form
    20,109.76/30,115.40 = 10,253.68/x
  3. Step 3: Cross multiply
    20,109.76x = 30,115.40 × 10,253.68
  4. Step 4: Simplify right side
    20,109.76x = 308,793,674.67
  5. Step 5: Solve for x
    x = 308,793,674.67/20,109.76
  6. Step 6: Final answer
    x = 15,355.41

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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.