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Finding the Fourth Proportional to 90,659.20, 135,859.20 and 66,780.40

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Solution

The fourth proportional to 90,659.20, 135,859.20 and 66,780.40 is: 100,075.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,659.20 : 135,859.20 = 66,780.40 : x
  2. Step 2: Convert to fraction form
    90,659.20/135,859.20 = 66,780.40/x
  3. Step 3: Cross multiply
    90,659.20x = 135,859.20 × 66,780.40
  4. Step 4: Simplify right side
    90,659.20x = 9,072,731,719.68
  5. Step 5: Solve for x
    x = 9,072,731,719.68/90,659.20
  6. Step 6: Final answer
    x = 100,075.14

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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.