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Finding the Fourth Proportional to 90,445.95, 135,674.24 and 30,469.42

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Solution

The fourth proportional to 90,445.95, 135,674.24 and 30,469.42 is: 45,705.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,445.95 : 135,674.24 = 30,469.42 : x
  2. Step 2: Convert to fraction form
    90,445.95/135,674.24 = 30,469.42/x
  3. Step 3: Cross multiply
    90,445.95x = 135,674.24 × 30,469.42
  4. Step 4: Simplify right side
    90,445.95x = 4,133,915,401.74
  5. Step 5: Solve for x
    x = 4,133,915,401.74/90,445.95
  6. Step 6: Final answer
    x = 45,705.92

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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.