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Finding the Fourth Proportional to 120,109.20, 180,163.80 and 61,060.20

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Solution

The fourth proportional to 120,109.20, 180,163.80 and 61,060.20 is: 91,590.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,109.20 : 180,163.80 = 61,060.20 : x
  2. Step 2: Convert to fraction form
    120,109.20/180,163.80 = 61,060.20/x
  3. Step 3: Cross multiply
    120,109.20x = 180,163.80 × 61,060.20
  4. Step 4: Simplify right side
    120,109.20x = 11,000,837,660.76
  5. Step 5: Solve for x
    x = 11,000,837,660.76/120,109.20
  6. Step 6: Final answer
    x = 91,590.30

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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.