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Finding the Fourth Proportional to 81,989.90, 112,408.05 and 80,495.22

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Solution

The fourth proportional to 81,989.90, 112,408.05 and 80,495.22 is: 110,358.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,989.90 : 112,408.05 = 80,495.22 : x
  2. Step 2: Convert to fraction form
    81,989.90/112,408.05 = 80,495.22/x
  3. Step 3: Cross multiply
    81,989.90x = 112,408.05 × 80,495.22
  4. Step 4: Simplify right side
    81,989.90x = 9,048,310,714.52
  5. Step 5: Solve for x
    x = 9,048,310,714.52/81,989.90
  6. Step 6: Final answer
    x = 110,358.85

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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.