Home / 20,979.92-28,961.36-15,001.20

Finding the Fourth Proportional to 20,979.92, 28,961.36 and 15,001.20

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Solution

The fourth proportional to 20,979.92, 28,961.36 and 15,001.20 is: 20,708.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.92 : 28,961.36 = 15,001.20 : x
  2. Step 2: Convert to fraction form
    20,979.92/28,961.36 = 15,001.20/x
  3. Step 3: Cross multiply
    20,979.92x = 28,961.36 × 15,001.20
  4. Step 4: Simplify right side
    20,979.92x = 434,455,153.63
  5. Step 5: Solve for x
    x = 434,455,153.63/20,979.92
  6. Step 6: Final answer
    x = 20,708.14

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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.