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Finding the Fourth Proportional to 28,085.68, 38,760.68 and 15,512.88

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Solution

The fourth proportional to 28,085.68, 38,760.68 and 15,512.88 is: 21,409.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,085.68 : 38,760.68 = 15,512.88 : x
  2. Step 2: Convert to fraction form
    28,085.68/38,760.68 = 15,512.88/x
  3. Step 3: Cross multiply
    28,085.68x = 38,760.68 × 15,512.88
  4. Step 4: Simplify right side
    28,085.68x = 601,289,777.56
  5. Step 5: Solve for x
    x = 601,289,777.56/28,085.68
  6. Step 6: Final answer
    x = 21,409.12

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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.