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Finding the Fourth Proportional to 79,781.28, 109,995.93 and 65,388.12

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Solution

The fourth proportional to 79,781.28, 109,995.93 and 65,388.12 is: 90,151.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,781.28 : 109,995.93 = 65,388.12 : x
  2. Step 2: Convert to fraction form
    79,781.28/109,995.93 = 65,388.12/x
  3. Step 3: Cross multiply
    79,781.28x = 109,995.93 × 65,388.12
  4. Step 4: Simplify right side
    79,781.28x = 7,192,427,070.35
  5. Step 5: Solve for x
    x = 7,192,427,070.35/79,781.28
  6. Step 6: Final answer
    x = 90,151.81

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1.5x scale

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.