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Finding the Fourth Proportional to 102.76, 140.88 and 100.04

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Solution

The fourth proportional to 102.76, 140.88 and 100.04 is: 137.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.76 : 140.88 = 100.04 : x
  2. Step 2: Convert to fraction form
    102.76/140.88 = 100.04/x
  3. Step 3: Cross multiply
    102.76x = 140.88 × 100.04
  4. Step 4: Simplify right side
    102.76x = 14,093.64
  5. Step 5: Solve for x
    x = 14,093.64/102.76
  6. Step 6: Final answer
    x = 137.15

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.