Home / 120,621.20-180,640.20-115,372.40

Finding the Fourth Proportional to 120,621.20, 180,640.20 and 115,372.40

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Solution

The fourth proportional to 120,621.20, 180,640.20 and 115,372.40 is: 172,779.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,621.20 : 180,640.20 = 115,372.40 : x
  2. Step 2: Convert to fraction form
    120,621.20/180,640.20 = 115,372.40/x
  3. Step 3: Cross multiply
    120,621.20x = 180,640.20 × 115,372.40
  4. Step 4: Simplify right side
    120,621.20x = 20,840,893,410.48
  5. Step 5: Solve for x
    x = 20,840,893,410.48/120,621.20
  6. Step 6: Final answer
    x = 172,779.69

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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.