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Finding the Fourth Proportional to 28,448.42, 42,679.10 and 8,729.78

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Solution

The fourth proportional to 28,448.42, 42,679.10 and 8,729.78 is: 13,096.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,448.42 : 42,679.10 = 8,729.78 : x
  2. Step 2: Convert to fraction form
    28,448.42/42,679.10 = 8,729.78/x
  3. Step 3: Cross multiply
    28,448.42x = 42,679.10 × 8,729.78
  4. Step 4: Simplify right side
    28,448.42x = 372,578,962.03
  5. Step 5: Solve for x
    x = 372,578,962.03/28,448.42
  6. Step 6: Final answer
    x = 13,096.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.