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Finding the Fourth Proportional to 15,803.80, 21,809.08 and 8,729.76

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Solution

The fourth proportional to 15,803.80, 21,809.08 and 8,729.76 is: 12,046.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,803.80 : 21,809.08 = 8,729.76 : x
  2. Step 2: Convert to fraction form
    15,803.80/21,809.08 = 8,729.76/x
  3. Step 3: Cross multiply
    15,803.80x = 21,809.08 × 8,729.76
  4. Step 4: Simplify right side
    15,803.80x = 190,388,034.22
  5. Step 5: Solve for x
    x = 190,388,034.22/15,803.80
  6. Step 6: Final answer
    x = 12,046.98

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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.