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Finding the Fourth Proportional to 90,019.60, 135,029.40 and 53,155.60

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Solution

The fourth proportional to 90,019.60, 135,029.40 and 53,155.60 is: 79,733.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,019.60 : 135,029.40 = 53,155.60 : x
  2. Step 2: Convert to fraction form
    90,019.60/135,029.40 = 53,155.60/x
  3. Step 3: Cross multiply
    90,019.60x = 135,029.40 × 53,155.60
  4. Step 4: Simplify right side
    90,019.60x = 7,177,568,774.64
  5. Step 5: Solve for x
    x = 7,177,568,774.64/90,019.60
  6. Step 6: Final answer
    x = 79,733.40

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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.