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Finding the Fourth Proportional to 90,640.10, 135,960.15 and 69,620.60

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Solution

The fourth proportional to 90,640.10, 135,960.15 and 69,620.60 is: 104,430.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,640.10 : 135,960.15 = 69,620.60 : x
  2. Step 2: Convert to fraction form
    90,640.10/135,960.15 = 69,620.60/x
  3. Step 3: Cross multiply
    90,640.10x = 135,960.15 × 69,620.60
  4. Step 4: Simplify right side
    90,640.10x = 9,465,627,219.09
  5. Step 5: Solve for x
    x = 9,465,627,219.09/90,640.10
  6. Step 6: Final answer
    x = 104,430.90

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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.