Home / 20,638.60-28,479.75-11,687.11

Finding the Fourth Proportional to 20,638.60, 28,479.75 and 11,687.11

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Solution

The fourth proportional to 20,638.60, 28,479.75 and 11,687.11 is: 16,127.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.60 : 28,479.75 = 11,687.11 : x
  2. Step 2: Convert to fraction form
    20,638.60/28,479.75 = 11,687.11/x
  3. Step 3: Cross multiply
    20,638.60x = 28,479.75 × 11,687.11
  4. Step 4: Simplify right side
    20,638.60x = 332,845,971.02
  5. Step 5: Solve for x
    x = 332,845,971.02/20,638.60
  6. Step 6: Final answer
    x = 16,127.35

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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.