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Finding the Fourth Proportional to 144,291.89, 216,481.56 and 69,390.78

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Solution

The fourth proportional to 144,291.89, 216,481.56 and 69,390.78 is: 104,107.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,291.89 : 216,481.56 = 69,390.78 : x
  2. Step 2: Convert to fraction form
    144,291.89/216,481.56 = 69,390.78/x
  3. Step 3: Cross multiply
    144,291.89x = 216,481.56 × 69,390.78
  4. Step 4: Simplify right side
    144,291.89x = 15,021,824,304.02
  5. Step 5: Solve for x
    x = 15,021,824,304.02/144,291.89
  6. Step 6: Final answer
    x = 104,107.20

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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.