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Finding the Fourth Proportional to 28,120.64, 42,174.78 and 8,396.64

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Solution

The fourth proportional to 28,120.64, 42,174.78 and 8,396.64 is: 12,593.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,120.64 : 42,174.78 = 8,396.64 : x
  2. Step 2: Convert to fraction form
    28,120.64/42,174.78 = 8,396.64/x
  3. Step 3: Cross multiply
    28,120.64x = 42,174.78 × 8,396.64
  4. Step 4: Simplify right side
    28,120.64x = 354,126,444.74
  5. Step 5: Solve for x
    x = 354,126,444.74/28,120.64
  6. Step 6: Final answer
    x = 12,593.11

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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.