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Finding the Fourth Proportional to 74,672.40, 111,935.70 and 66,799.20

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Solution

The fourth proportional to 74,672.40, 111,935.70 and 66,799.20 is: 100,133.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,672.40 : 111,935.70 = 66,799.20 : x
  2. Step 2: Convert to fraction form
    74,672.40/111,935.70 = 66,799.20/x
  3. Step 3: Cross multiply
    74,672.40x = 111,935.70 × 66,799.20
  4. Step 4: Simplify right side
    74,672.40x = 7,477,215,211.44
  5. Step 5: Solve for x
    x = 7,477,215,211.44/74,672.40
  6. Step 6: Final answer
    x = 100,133.59

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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.