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Finding the Fourth Proportional to 20,642.76, 28,487.16 and 11,211.48

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Solution

The fourth proportional to 20,642.76, 28,487.16 and 11,211.48 is: 15,471.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.76 : 28,487.16 = 11,211.48 : x
  2. Step 2: Convert to fraction form
    20,642.76/28,487.16 = 11,211.48/x
  3. Step 3: Cross multiply
    20,642.76x = 28,487.16 × 11,211.48
  4. Step 4: Simplify right side
    20,642.76x = 319,383,224.60
  5. Step 5: Solve for x
    x = 319,383,224.60/20,642.76
  6. Step 6: Final answer
    x = 15,471.92

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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.