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Finding the Fourth Proportional to 103.26, 142.02 and 90.94

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Solution

The fourth proportional to 103.26, 142.02 and 90.94 is: 125.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.26 : 142.02 = 90.94 : x
  2. Step 2: Convert to fraction form
    103.26/142.02 = 90.94/x
  3. Step 3: Cross multiply
    103.26x = 142.02 × 90.94
  4. Step 4: Simplify right side
    103.26x = 12,915.30
  5. Step 5: Solve for x
    x = 12,915.30/103.26
  6. Step 6: Final answer
    x = 125.08

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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.