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Finding the Fourth Proportional to 120,679.35, 180,960.57 and 70,775.79

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Solution

The fourth proportional to 120,679.35, 180,960.57 and 70,775.79 is: 106,129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,679.35 : 180,960.57 = 70,775.79 : x
  2. Step 2: Convert to fraction form
    120,679.35/180,960.57 = 70,775.79/x
  3. Step 3: Cross multiply
    120,679.35x = 180,960.57 × 70,775.79
  4. Step 4: Simplify right side
    120,679.35x = 12,807,627,300.60
  5. Step 5: Solve for x
    x = 12,807,627,300.60/120,679.35
  6. Step 6: Final answer
    x = 106,129.40

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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.