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Finding the Fourth Proportional to 154,181.80, 212,766.78 and 87,113.80

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Solution

The fourth proportional to 154,181.80, 212,766.78 and 87,113.80 is: 120,214.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,181.80 : 212,766.78 = 87,113.80 : x
  2. Step 2: Convert to fraction form
    154,181.80/212,766.78 = 87,113.80/x
  3. Step 3: Cross multiply
    154,181.80x = 212,766.78 × 87,113.80
  4. Step 4: Simplify right side
    154,181.80x = 18,534,922,719.56
  5. Step 5: Solve for x
    x = 18,534,922,719.56/154,181.80
  6. Step 6: Final answer
    x = 120,214.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.