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Finding the Fourth Proportional to 81,220.88, 112,081 and 45,415.44

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Solution

The fourth proportional to 81,220.88, 112,081 and 45,415.44 is: 62,671.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,220.88 : 112,081 = 45,415.44 : x
  2. Step 2: Convert to fraction form
    81,220.88/112,081 = 45,415.44/x
  3. Step 3: Cross multiply
    81,220.88x = 112,081 × 45,415.44
  4. Step 4: Simplify right side
    81,220.88x = 5,090,207,930.64
  5. Step 5: Solve for x
    x = 5,090,207,930.64/81,220.88
  6. Step 6: Final answer
    x = 62,671.17

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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.