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Finding the Fourth Proportional to 71,991.74, 99,347.91 and 39,726.65

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Solution

The fourth proportional to 71,991.74, 99,347.91 and 39,726.65 is: 54,822.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,991.74 : 99,347.91 = 39,726.65 : x
  2. Step 2: Convert to fraction form
    71,991.74/99,347.91 = 39,726.65/x
  3. Step 3: Cross multiply
    71,991.74x = 99,347.91 × 39,726.65
  4. Step 4: Simplify right side
    71,991.74x = 3,946,759,152.06
  5. Step 5: Solve for x
    x = 3,946,759,152.06/71,991.74
  6. Step 6: Final answer
    x = 54,822.39

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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.