Home / 90,470.20-135,705.30-81,284.80

Finding the Fourth Proportional to 90,470.20, 135,705.30 and 81,284.80

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Solution

The fourth proportional to 90,470.20, 135,705.30 and 81,284.80 is: 121,927.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,470.20 : 135,705.30 = 81,284.80 : x
  2. Step 2: Convert to fraction form
    90,470.20/135,705.30 = 81,284.80/x
  3. Step 3: Cross multiply
    90,470.20x = 135,705.30 × 81,284.80
  4. Step 4: Simplify right side
    90,470.20x = 11,030,778,169.44
  5. Step 5: Solve for x
    x = 11,030,778,169.44/90,470.20
  6. Step 6: Final answer
    x = 121,927.20

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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.