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Finding the Fourth Proportional to 79,686.72, 109,970.40 and 43,879.20

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Solution

The fourth proportional to 79,686.72, 109,970.40 and 43,879.20 is: 60,554.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,686.72 : 109,970.40 = 43,879.20 : x
  2. Step 2: Convert to fraction form
    79,686.72/109,970.40 = 43,879.20/x
  3. Step 3: Cross multiply
    79,686.72x = 109,970.40 × 43,879.20
  4. Step 4: Simplify right side
    79,686.72x = 4,825,413,175.68
  5. Step 5: Solve for x
    x = 4,825,413,175.68/79,686.72
  6. Step 6: Final answer
    x = 60,554.80

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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.