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Finding the Fourth Proportional to 90.99, 137.30 and 88.97

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Solution

The fourth proportional to 90.99, 137.30 and 88.97 is: 134.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.99 : 137.30 = 88.97 : x
  2. Step 2: Convert to fraction form
    90.99/137.30 = 88.97/x
  3. Step 3: Cross multiply
    90.99x = 137.30 × 88.97
  4. Step 4: Simplify right side
    90.99x = 12,214.45
  5. Step 5: Solve for x
    x = 12,214.45/90.99
  6. Step 6: Final answer
    x = 134.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.