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Finding the Fourth Proportional to 90.21, 135.35 and 29.35

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Solution

The fourth proportional to 90.21, 135.35 and 29.35 is: 44.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.21 : 135.35 = 29.35 : x
  2. Step 2: Convert to fraction form
    90.21/135.35 = 29.35/x
  3. Step 3: Cross multiply
    90.21x = 135.35 × 29.35
  4. Step 4: Simplify right side
    90.21x = 3,972.52
  5. Step 5: Solve for x
    x = 3,972.52/90.21
  6. Step 6: Final answer
    x = 44.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.