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Finding the Fourth Proportional to 72,422.70, 108,634.05 and 19,830.30

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Solution

The fourth proportional to 72,422.70, 108,634.05 and 19,830.30 is: 29,745.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,422.70 : 108,634.05 = 19,830.30 : x
  2. Step 2: Convert to fraction form
    72,422.70/108,634.05 = 19,830.30/x
  3. Step 3: Cross multiply
    72,422.70x = 108,634.05 × 19,830.30
  4. Step 4: Simplify right side
    72,422.70x = 2,154,245,801.72
  5. Step 5: Solve for x
    x = 2,154,245,801.72/72,422.70
  6. Step 6: Final answer
    x = 29,745.45

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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.