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Finding the Fourth Proportional to 90,645.80, 135,968.70 and 51,279.80

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Solution

The fourth proportional to 90,645.80, 135,968.70 and 51,279.80 is: 76,919.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,645.80 : 135,968.70 = 51,279.80 : x
  2. Step 2: Convert to fraction form
    90,645.80/135,968.70 = 51,279.80/x
  3. Step 3: Cross multiply
    90,645.80x = 135,968.70 × 51,279.80
  4. Step 4: Simplify right side
    90,645.80x = 6,972,447,742.26
  5. Step 5: Solve for x
    x = 6,972,447,742.26/90,645.80
  6. Step 6: Final answer
    x = 76,919.70

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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.