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Finding the Fourth Proportional to 120,787.80, 181,181.70 and 85,358.40

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Solution

The fourth proportional to 120,787.80, 181,181.70 and 85,358.40 is: 128,037.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,787.80 : 181,181.70 = 85,358.40 : x
  2. Step 2: Convert to fraction form
    120,787.80/181,181.70 = 85,358.40/x
  3. Step 3: Cross multiply
    120,787.80x = 181,181.70 × 85,358.40
  4. Step 4: Simplify right side
    120,787.80x = 15,465,380,021.28
  5. Step 5: Solve for x
    x = 15,465,380,021.28/120,787.80
  6. Step 6: Final answer
    x = 128,037.60

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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.