Home / 90,608.20-135,782.70-66,729.40

Finding the Fourth Proportional to 90,608.20, 135,782.70 and 66,729.40

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Solution

The fourth proportional to 90,608.20, 135,782.70 and 66,729.40 is: 99,998.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,608.20 : 135,782.70 = 66,729.40 : x
  2. Step 2: Convert to fraction form
    90,608.20/135,782.70 = 66,729.40/x
  3. Step 3: Cross multiply
    90,608.20x = 135,782.70 × 66,729.40
  4. Step 4: Simplify right side
    90,608.20x = 9,060,698,101.38
  5. Step 5: Solve for x
    x = 9,060,698,101.38/90,608.20
  6. Step 6: Final answer
    x = 99,998.65

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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.