Home / 90,629.20-135,943.80-81,443.80

Finding the Fourth Proportional to 90,629.20, 135,943.80 and 81,443.80

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Solution

The fourth proportional to 90,629.20, 135,943.80 and 81,443.80 is: 122,165.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,629.20 : 135,943.80 = 81,443.80 : x
  2. Step 2: Convert to fraction form
    90,629.20/135,943.80 = 81,443.80/x
  3. Step 3: Cross multiply
    90,629.20x = 135,943.80 × 81,443.80
  4. Step 4: Simplify right side
    90,629.20x = 11,071,779,658.44
  5. Step 5: Solve for x
    x = 11,071,779,658.44/90,629.20
  6. Step 6: Final answer
    x = 122,165.70

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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.