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Finding the Fourth Proportional to 136,991.66, 205,487.87 and 42,218.80

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Solution

The fourth proportional to 136,991.66, 205,487.87 and 42,218.80 is: 63,328.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,991.66 : 205,487.87 = 42,218.80 : x
  2. Step 2: Convert to fraction form
    136,991.66/205,487.87 = 42,218.80/x
  3. Step 3: Cross multiply
    136,991.66x = 205,487.87 × 42,218.80
  4. Step 4: Simplify right side
    136,991.66x = 8,675,450,561.14
  5. Step 5: Solve for x
    x = 8,675,450,561.14/136,991.66
  6. Step 6: Final answer
    x = 63,328.31

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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.