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Finding the Fourth Proportional to 103.28, 141.94 and 100.40

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Solution

The fourth proportional to 103.28, 141.94 and 100.40 is: 137.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.28 : 141.94 = 100.40 : x
  2. Step 2: Convert to fraction form
    103.28/141.94 = 100.40/x
  3. Step 3: Cross multiply
    103.28x = 141.94 × 100.40
  4. Step 4: Simplify right side
    103.28x = 14,250.78
  5. Step 5: Solve for x
    x = 14,250.78/103.28
  6. Step 6: Final answer
    x = 137.98

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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.