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Finding the Fourth Proportional to 79,781.44, 109,946.85 and 57,081.07

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Solution

The fourth proportional to 79,781.44, 109,946.85 and 57,081.07 is: 78,663.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,781.44 : 109,946.85 = 57,081.07 : x
  2. Step 2: Convert to fraction form
    79,781.44/109,946.85 = 57,081.07/x
  3. Step 3: Cross multiply
    79,781.44x = 109,946.85 × 57,081.07
  4. Step 4: Simplify right side
    79,781.44x = 6,275,883,841.13
  5. Step 5: Solve for x
    x = 6,275,883,841.13/79,781.44
  6. Step 6: Final answer
    x = 78,663.46

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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.