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Finding the Fourth Proportional to 81,220.46, 121,936.80 and 65,218.54

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Solution

The fourth proportional to 81,220.46, 121,936.80 and 65,218.54 is: 97,913.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,220.46 : 121,936.80 = 65,218.54 : x
  2. Step 2: Convert to fraction form
    81,220.46/121,936.80 = 65,218.54/x
  3. Step 3: Cross multiply
    81,220.46x = 121,936.80 × 65,218.54
  4. Step 4: Simplify right side
    81,220.46x = 7,952,540,068.27
  5. Step 5: Solve for x
    x = 7,952,540,068.27/81,220.46
  6. Step 6: Final answer
    x = 97,913.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.