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Finding the Fourth Proportional to 90.02, 134.82 and 72.02

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Solution

The fourth proportional to 90.02, 134.82 and 72.02 is: 107.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.02 : 134.82 = 72.02 : x
  2. Step 2: Convert to fraction form
    90.02/134.82 = 72.02/x
  3. Step 3: Cross multiply
    90.02x = 134.82 × 72.02
  4. Step 4: Simplify right side
    90.02x = 9,709.74
  5. Step 5: Solve for x
    x = 9,709.74/90.02
  6. Step 6: Final answer
    x = 107.86

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.