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Finding the Fourth Proportional to 81,661.44, 112,610.88 and 77,220.48

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Solution

The fourth proportional to 81,661.44, 112,610.88 and 77,220.48 is: 106,486.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,661.44 : 112,610.88 = 77,220.48 : x
  2. Step 2: Convert to fraction form
    81,661.44/112,610.88 = 77,220.48/x
  3. Step 3: Cross multiply
    81,661.44x = 112,610.88 × 77,220.48
  4. Step 4: Simplify right side
    81,661.44x = 8,695,866,206.82
  5. Step 5: Solve for x
    x = 8,695,866,206.82/81,661.44
  6. Step 6: Final answer
    x = 106,486.81

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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.