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Finding the Fourth Proportional to 100.94, 139.02 and 100.64

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Solution

The fourth proportional to 100.94, 139.02 and 100.64 is: 138.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.94 : 139.02 = 100.64 : x
  2. Step 2: Convert to fraction form
    100.94/139.02 = 100.64/x
  3. Step 3: Cross multiply
    100.94x = 139.02 × 100.64
  4. Step 4: Simplify right side
    100.94x = 13,990.97
  5. Step 5: Solve for x
    x = 13,990.97/100.94
  6. Step 6: Final answer
    x = 138.61

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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.