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Finding the Fourth Proportional to 89.21, 133.58 and 58.69

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Solution

The fourth proportional to 89.21, 133.58 and 58.69 is: 87.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.21 : 133.58 = 58.69 : x
  2. Step 2: Convert to fraction form
    89.21/133.58 = 58.69/x
  3. Step 3: Cross multiply
    89.21x = 133.58 × 58.69
  4. Step 4: Simplify right side
    89.21x = 7,840.12
  5. Step 5: Solve for x
    x = 7,840.12/89.21
  6. Step 6: Final answer
    x = 87.88

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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.