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Finding the Fourth Proportional to 90.37, 135.57 and 39.03

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Solution

The fourth proportional to 90.37, 135.57 and 39.03 is: 58.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.37 : 135.57 = 39.03 : x
  2. Step 2: Convert to fraction form
    90.37/135.57 = 39.03/x
  3. Step 3: Cross multiply
    90.37x = 135.57 × 39.03
  4. Step 4: Simplify right side
    90.37x = 5,291.37
  5. Step 5: Solve for x
    x = 5,291.37/90.37
  6. Step 6: Final answer
    x = 58.55

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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.