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Finding the Fourth Proportional to 64,804.80, 89,404.32 and 39,668.88

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Solution

The fourth proportional to 64,804.80, 89,404.32 and 39,668.88 is: 54,726.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,804.80 : 89,404.32 = 39,668.88 : x
  2. Step 2: Convert to fraction form
    64,804.80/89,404.32 = 39,668.88/x
  3. Step 3: Cross multiply
    64,804.80x = 89,404.32 × 39,668.88
  4. Step 4: Simplify right side
    64,804.80x = 3,546,569,241.56
  5. Step 5: Solve for x
    x = 3,546,569,241.56/64,804.80
  6. Step 6: Final answer
    x = 54,726.95

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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.