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Finding the Fourth Proportional to 80,672.40, 121,008.60 and 28,087.20

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Solution

The fourth proportional to 80,672.40, 121,008.60 and 28,087.20 is: 42,130.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,672.40 : 121,008.60 = 28,087.20 : x
  2. Step 2: Convert to fraction form
    80,672.40/121,008.60 = 28,087.20/x
  3. Step 3: Cross multiply
    80,672.40x = 121,008.60 × 28,087.20
  4. Step 4: Simplify right side
    80,672.40x = 3,398,792,749.92
  5. Step 5: Solve for x
    x = 3,398,792,749.92/80,672.40
  6. Step 6: Final answer
    x = 42,130.80

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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.