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Finding the Fourth Proportional to 90.57, 135.86 and 90.03

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Solution

The fourth proportional to 90.57, 135.86 and 90.03 is: 135.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.57 : 135.86 = 90.03 : x
  2. Step 2: Convert to fraction form
    90.57/135.86 = 90.03/x
  3. Step 3: Cross multiply
    90.57x = 135.86 × 90.03
  4. Step 4: Simplify right side
    90.57x = 12,231.03
  5. Step 5: Solve for x
    x = 12,231.03/90.57
  6. Step 6: Final answer
    x = 135.05

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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.