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Finding the Fourth Proportional to 120,586.60, 180,701.70 and 87,376.60

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Solution

The fourth proportional to 120,586.60, 180,701.70 and 87,376.60 is: 130,935.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,586.60 : 180,701.70 = 87,376.60 : x
  2. Step 2: Convert to fraction form
    120,586.60/180,701.70 = 87,376.60/x
  3. Step 3: Cross multiply
    120,586.60x = 180,701.70 × 87,376.60
  4. Step 4: Simplify right side
    120,586.60x = 15,789,100,160.22
  5. Step 5: Solve for x
    x = 15,789,100,160.22/120,586.60
  6. Step 6: Final answer
    x = 130,935.78

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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.