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Finding the Fourth Proportional to 15,803.52, 21,808.80 and 8,729.76

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Solution

The fourth proportional to 15,803.52, 21,808.80 and 8,729.76 is: 12,047.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,803.52 : 21,808.80 = 8,729.76 : x
  2. Step 2: Convert to fraction form
    15,803.52/21,808.80 = 8,729.76/x
  3. Step 3: Cross multiply
    15,803.52x = 21,808.80 × 8,729.76
  4. Step 4: Simplify right side
    15,803.52x = 190,385,589.89
  5. Step 5: Solve for x
    x = 190,385,589.89/15,803.52
  6. Step 6: Final answer
    x = 12,047.04

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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.