Home / 20,971.12-28,938.66-12,472.78

Finding the Fourth Proportional to 20,971.12, 28,938.66 and 12,472.78

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Solution

The fourth proportional to 20,971.12, 28,938.66 and 12,472.78 is: 17,211.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.12 : 28,938.66 = 12,472.78 : x
  2. Step 2: Convert to fraction form
    20,971.12/28,938.66 = 12,472.78/x
  3. Step 3: Cross multiply
    20,971.12x = 28,938.66 × 12,472.78
  4. Step 4: Simplify right side
    20,971.12x = 360,945,539.67
  5. Step 5: Solve for x
    x = 360,945,539.67/20,971.12
  6. Step 6: Final answer
    x = 17,211.55

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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.