Home / 20,638.48-28,481.16-11,207.20

Finding the Fourth Proportional to 20,638.48, 28,481.16 and 11,207.20

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Solution

The fourth proportional to 20,638.48, 28,481.16 and 11,207.20 is: 15,465.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.48 : 28,481.16 = 11,207.20 : x
  2. Step 2: Convert to fraction form
    20,638.48/28,481.16 = 11,207.20/x
  3. Step 3: Cross multiply
    20,638.48x = 28,481.16 × 11,207.20
  4. Step 4: Simplify right side
    20,638.48x = 319,194,056.35
  5. Step 5: Solve for x
    x = 319,194,056.35/20,638.48
  6. Step 6: Final answer
    x = 15,465.97

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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.