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Finding the Fourth Proportional to 90,735.40, 135,843.90 and 81,404.20

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Solution

The fourth proportional to 90,735.40, 135,843.90 and 81,404.20 is: 121,873.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,735.40 : 135,843.90 = 81,404.20 : x
  2. Step 2: Convert to fraction form
    90,735.40/135,843.90 = 81,404.20/x
  3. Step 3: Cross multiply
    90,735.40x = 135,843.90 × 81,404.20
  4. Step 4: Simplify right side
    90,735.40x = 11,058,264,004.38
  5. Step 5: Solve for x
    x = 11,058,264,004.38/90,735.40
  6. Step 6: Final answer
    x = 121,873.76

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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.