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Finding the Fourth Proportional to 15,803.42, 21,808.72 and 8,729.84

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Solution

The fourth proportional to 15,803.42, 21,808.72 and 8,729.84 is: 12,047.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,803.42 : 21,808.72 = 8,729.84 : x
  2. Step 2: Convert to fraction form
    15,803.42/21,808.72 = 8,729.84/x
  3. Step 3: Cross multiply
    15,803.42x = 21,808.72 × 8,729.84
  4. Step 4: Simplify right side
    15,803.42x = 190,386,636.20
  5. Step 5: Solve for x
    x = 190,386,636.20/15,803.42
  6. Step 6: Final answer
    x = 12,047.18

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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.