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Finding the Fourth Proportional to 90.37, 135.46 and 49.78

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Solution

The fourth proportional to 90.37, 135.46 and 49.78 is: 74.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.37 : 135.46 = 49.78 : x
  2. Step 2: Convert to fraction form
    90.37/135.46 = 49.78/x
  3. Step 3: Cross multiply
    90.37x = 135.46 × 49.78
  4. Step 4: Simplify right side
    90.37x = 6,743.20
  5. Step 5: Solve for x
    x = 6,743.20/90.37
  6. Step 6: Final answer
    x = 74.62

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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.