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Finding the Fourth Proportional to 90,690.75, 125,214.21 and 81,100.80

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Solution

The fourth proportional to 90,690.75, 125,214.21 and 81,100.80 is: 111,973.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,690.75 : 125,214.21 = 81,100.80 : x
  2. Step 2: Convert to fraction form
    90,690.75/125,214.21 = 81,100.80/x
  3. Step 3: Cross multiply
    90,690.75x = 125,214.21 × 81,100.80
  4. Step 4: Simplify right side
    90,690.75x = 10,154,972,602.37
  5. Step 5: Solve for x
    x = 10,154,972,602.37/90,690.75
  6. Step 6: Final answer
    x = 111,973.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.