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Finding the Fourth Proportional to 90.34, 135.42 and 57.94

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Solution

The fourth proportional to 90.34, 135.42 and 57.94 is: 86.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.34 : 135.42 = 57.94 : x
  2. Step 2: Convert to fraction form
    90.34/135.42 = 57.94/x
  3. Step 3: Cross multiply
    90.34x = 135.42 × 57.94
  4. Step 4: Simplify right side
    90.34x = 7,846.23
  5. Step 5: Solve for x
    x = 7,846.23/90.34
  6. Step 6: Final answer
    x = 86.85

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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.