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Finding the Fourth Proportional to 99,489.78, 149,187.87 and 40,280.40

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Solution

The fourth proportional to 99,489.78, 149,187.87 and 40,280.40 is: 60,401.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,489.78 : 149,187.87 = 40,280.40 : x
  2. Step 2: Convert to fraction form
    99,489.78/149,187.87 = 40,280.40/x
  3. Step 3: Cross multiply
    99,489.78x = 149,187.87 × 40,280.40
  4. Step 4: Simplify right side
    99,489.78x = 6,009,347,078.75
  5. Step 5: Solve for x
    x = 6,009,347,078.75/99,489.78
  6. Step 6: Final answer
    x = 60,401.65

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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.