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Finding the Fourth Proportional to 90.14, 135.21 and 35.30

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Solution

The fourth proportional to 90.14, 135.21 and 35.30 is: 52.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.14 : 135.21 = 35.30 : x
  2. Step 2: Convert to fraction form
    90.14/135.21 = 35.30/x
  3. Step 3: Cross multiply
    90.14x = 135.21 × 35.30
  4. Step 4: Simplify right side
    90.14x = 4,772.91
  5. Step 5: Solve for x
    x = 4,772.91/90.14
  6. Step 6: Final answer
    x = 52.95

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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.