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Finding the Fourth Proportional to 78,961.68, 109,082.36 and 68,332.86

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Solution

The fourth proportional to 78,961.68, 109,082.36 and 68,332.86 is: 94,399.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,961.68 : 109,082.36 = 68,332.86 : x
  2. Step 2: Convert to fraction form
    78,961.68/109,082.36 = 68,332.86/x
  3. Step 3: Cross multiply
    78,961.68x = 109,082.36 × 68,332.86
  4. Step 4: Simplify right side
    78,961.68x = 7,453,909,634.35
  5. Step 5: Solve for x
    x = 7,453,909,634.35/78,961.68
  6. Step 6: Final answer
    x = 94,399.08

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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.