Home / 20,431.81-28,196.62-11,479.13

Finding the Fourth Proportional to 20,431.81, 28,196.62 and 11,479.13

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Solution

The fourth proportional to 20,431.81, 28,196.62 and 11,479.13 is: 15,841.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.81 : 28,196.62 = 11,479.13 : x
  2. Step 2: Convert to fraction form
    20,431.81/28,196.62 = 11,479.13/x
  3. Step 3: Cross multiply
    20,431.81x = 28,196.62 × 11,479.13
  4. Step 4: Simplify right side
    20,431.81x = 323,672,666.54
  5. Step 5: Solve for x
    x = 323,672,666.54/20,431.81
  6. Step 6: Final answer
    x = 15,841.61

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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.