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Finding the Fourth Proportional to 81,990.90, 112,409.42 and 80,496.22

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Solution

The fourth proportional to 81,990.90, 112,409.42 and 80,496.22 is: 110,360.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,990.90 : 112,409.42 = 80,496.22 : x
  2. Step 2: Convert to fraction form
    81,990.90/112,409.42 = 80,496.22/x
  3. Step 3: Cross multiply
    81,990.90x = 112,409.42 × 80,496.22
  4. Step 4: Simplify right side
    81,990.90x = 9,048,533,402.39
  5. Step 5: Solve for x
    x = 9,048,533,402.39/81,990.90
  6. Step 6: Final answer
    x = 110,360.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.