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Finding the Fourth Proportional to 79,840.74, 119,780.34 and 29,921.28

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Solution

The fourth proportional to 79,840.74, 119,780.34 and 29,921.28 is: 44,889.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,840.74 : 119,780.34 = 29,921.28 : x
  2. Step 2: Convert to fraction form
    79,840.74/119,780.34 = 29,921.28/x
  3. Step 3: Cross multiply
    79,840.74x = 119,780.34 × 29,921.28
  4. Step 4: Simplify right side
    79,840.74x = 3,583,981,091.64
  5. Step 5: Solve for x
    x = 3,583,981,091.64/79,840.74
  6. Step 6: Final answer
    x = 44,889.13

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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.