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Finding the Fourth Proportional to 72,866,679.78, 109,283,895.99 and 21,040,032.21

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Solution

The fourth proportional to 72,866,679.78, 109,283,895.99 and 21,040,032.21 is: 31,555,392.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,866,679.78 : 109,283,895.99 = 21,040,032.21 : x
  2. Step 2: Convert to fraction form
    72,866,679.78/109,283,895.99 = 21,040,032.21/x
  3. Step 3: Cross multiply
    72,866,679.78x = 109,283,895.99 × 21,040,032.21
  4. Step 4: Simplify right side
    72,866,679.78x = 2,299,336,691,663,890
  5. Step 5: Solve for x
    x = 2,299,336,691,663,890/72,866,679.78
  6. Step 6: Final answer
    x = 31,555,392.65

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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.