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Finding the Fourth Proportional to 120,604.80, 180,758.40 and 87,438.72

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Solution

The fourth proportional to 120,604.80, 180,758.40 and 87,438.72 is: 131,050.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,604.80 : 180,758.40 = 87,438.72 : x
  2. Step 2: Convert to fraction form
    120,604.80/180,758.40 = 87,438.72/x
  3. Step 3: Cross multiply
    120,604.80x = 180,758.40 × 87,438.72
  4. Step 4: Simplify right side
    120,604.80x = 15,805,283,125.25
  5. Step 5: Solve for x
    x = 15,805,283,125.25/120,604.80
  6. Step 6: Final answer
    x = 131,050.20

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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.