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Finding the Fourth Proportional to 68,991.86, 103,619.10 and 42,879.08

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Solution

The fourth proportional to 68,991.86, 103,619.10 and 42,879.08 is: 64,400.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,991.86 : 103,619.10 = 42,879.08 : x
  2. Step 2: Convert to fraction form
    68,991.86/103,619.10 = 42,879.08/x
  3. Step 3: Cross multiply
    68,991.86x = 103,619.10 × 42,879.08
  4. Step 4: Simplify right side
    68,991.86x = 4,443,091,678.43
  5. Step 5: Solve for x
    x = 4,443,091,678.43/68,991.86
  6. Step 6: Final answer
    x = 64,400.23

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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.