Home / 20,429.11-28,190.66-11,478.11

Finding the Fourth Proportional to 20,429.11, 28,190.66 and 11,478.11

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Solution

The fourth proportional to 20,429.11, 28,190.66 and 11,478.11 is: 15,838.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,429.11 : 28,190.66 = 11,478.11 : x
  2. Step 2: Convert to fraction form
    20,429.11/28,190.66 = 11,478.11/x
  3. Step 3: Cross multiply
    20,429.11x = 28,190.66 × 11,478.11
  4. Step 4: Simplify right side
    20,429.11x = 323,575,330.39
  5. Step 5: Solve for x
    x = 323,575,330.39/20,429.11
  6. Step 6: Final answer
    x = 15,838.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.