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Finding the Fourth Proportional to 90.37, 135.47 and 51.94

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Solution

The fourth proportional to 90.37, 135.47 and 51.94 is: 77.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.37 : 135.47 = 51.94 : x
  2. Step 2: Convert to fraction form
    90.37/135.47 = 51.94/x
  3. Step 3: Cross multiply
    90.37x = 135.47 × 51.94
  4. Step 4: Simplify right side
    90.37x = 7,036.61
  5. Step 5: Solve for x
    x = 7,036.61/90.37
  6. Step 6: Final answer
    x = 77.87

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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.