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Finding the Fourth Proportional to 90,415.20, 135,493.20 and 66,536.40

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Solution

The fourth proportional to 90,415.20, 135,493.20 and 66,536.40 is: 99,709.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,415.20 : 135,493.20 = 66,536.40 : x
  2. Step 2: Convert to fraction form
    90,415.20/135,493.20 = 66,536.40/x
  3. Step 3: Cross multiply
    90,415.20x = 135,493.20 × 66,536.40
  4. Step 4: Simplify right side
    90,415.20x = 9,015,229,752.48
  5. Step 5: Solve for x
    x = 9,015,229,752.48/90,415.20
  6. Step 6: Final answer
    x = 99,709.23

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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.