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Finding the Fourth Proportional to 100.86, 139.27 and 68.22

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Solution

The fourth proportional to 100.86, 139.27 and 68.22 is: 94.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.86 : 139.27 = 68.22 : x
  2. Step 2: Convert to fraction form
    100.86/139.27 = 68.22/x
  3. Step 3: Cross multiply
    100.86x = 139.27 × 68.22
  4. Step 4: Simplify right side
    100.86x = 9,501.00
  5. Step 5: Solve for x
    x = 9,501.00/100.86
  6. Step 6: Final answer
    x = 94.20

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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.