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Finding the Fourth Proportional to 90,401.60, 135,218.40 and 81,108.80

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Solution

The fourth proportional to 90,401.60, 135,218.40 and 81,108.80 is: 121,318.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,401.60 : 135,218.40 = 81,108.80 : x
  2. Step 2: Convert to fraction form
    90,401.60/135,218.40 = 81,108.80/x
  3. Step 3: Cross multiply
    90,401.60x = 135,218.40 × 81,108.80
  4. Step 4: Simplify right side
    90,401.60x = 10,967,402,161.92
  5. Step 5: Solve for x
    x = 10,967,402,161.92/90,401.60
  6. Step 6: Final answer
    x = 121,318.67

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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.