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Finding the Fourth Proportional to 120,665.60, 180,820.20 and 87,455.60

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Solution

The fourth proportional to 120,665.60, 180,820.20 and 87,455.60 is: 131,054.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,665.60 : 180,820.20 = 87,455.60 : x
  2. Step 2: Convert to fraction form
    120,665.60/180,820.20 = 87,455.60/x
  3. Step 3: Cross multiply
    120,665.60x = 180,820.20 × 87,455.60
  4. Step 4: Simplify right side
    120,665.60x = 15,813,739,083.12
  5. Step 5: Solve for x
    x = 15,813,739,083.12/120,665.60
  6. Step 6: Final answer
    x = 131,054.24

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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.