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Finding the Fourth Proportional to 90, 134.90 and 53.94

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Solution

The fourth proportional to 90, 134.90 and 53.94 is: 80.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90 : 134.90 = 53.94 : x
  2. Step 2: Convert to fraction form
    90/134.90 = 53.94/x
  3. Step 3: Cross multiply
    90x = 134.90 × 53.94
  4. Step 4: Simplify right side
    90x = 7,276.51
  5. Step 5: Solve for x
    x = 7,276.51/90
  6. Step 6: Final answer
    x = 80.85

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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.