Home / 66,439.20-99,609.20-40,138.40

Finding the Fourth Proportional to 66,439.20, 99,609.20 and 40,138.40

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Solution

The fourth proportional to 66,439.20, 99,609.20 and 40,138.40 is: 60,177.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,439.20 : 99,609.20 = 40,138.40 : x
  2. Step 2: Convert to fraction form
    66,439.20/99,609.20 = 40,138.40/x
  3. Step 3: Cross multiply
    66,439.20x = 99,609.20 × 40,138.40
  4. Step 4: Simplify right side
    66,439.20x = 3,998,153,913.28
  5. Step 5: Solve for x
    x = 3,998,153,913.28/66,439.20
  6. Step 6: Final answer
    x = 60,177.63

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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.