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Finding the Fourth Proportional to 66,222, 91,405.80 and 39,383.52

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Solution

The fourth proportional to 66,222, 91,405.80 and 39,383.52 is: 54,360.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,222 : 91,405.80 = 39,383.52 : x
  2. Step 2: Convert to fraction form
    66,222/91,405.80 = 39,383.52/x
  3. Step 3: Cross multiply
    66,222x = 91,405.80 × 39,383.52
  4. Step 4: Simplify right side
    66,222x = 3,599,882,152.42
  5. Step 5: Solve for x
    x = 3,599,882,152.42/66,222
  6. Step 6: Final answer
    x = 54,360.82

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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.