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Finding the Fourth Proportional to 89.21, 134.58 and 89.03

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Solution

The fourth proportional to 89.21, 134.58 and 89.03 is: 134.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.21 : 134.58 = 89.03 : x
  2. Step 2: Convert to fraction form
    89.21/134.58 = 89.03/x
  3. Step 3: Cross multiply
    89.21x = 134.58 × 89.03
  4. Step 4: Simplify right side
    89.21x = 11,981.43
  5. Step 5: Solve for x
    x = 11,981.43/89.21
  6. Step 6: Final answer
    x = 134.31

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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.