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Finding the Fourth Proportional to 109,931.20, 164,896.80 and 87,380.80

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Solution

The fourth proportional to 109,931.20, 164,896.80 and 87,380.80 is: 131,071.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,931.20 : 164,896.80 = 87,380.80 : x
  2. Step 2: Convert to fraction form
    109,931.20/164,896.80 = 87,380.80/x
  3. Step 3: Cross multiply
    109,931.20x = 164,896.80 × 87,380.80
  4. Step 4: Simplify right side
    109,931.20x = 14,408,814,301.44
  5. Step 5: Solve for x
    x = 14,408,814,301.44/109,931.20
  6. Step 6: Final answer
    x = 131,071.20

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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.