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Finding the Fourth Proportional to 89.58, 134.08 and 72.30

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Solution

The fourth proportional to 89.58, 134.08 and 72.30 is: 108.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.58 : 134.08 = 72.30 : x
  2. Step 2: Convert to fraction form
    89.58/134.08 = 72.30/x
  3. Step 3: Cross multiply
    89.58x = 134.08 × 72.30
  4. Step 4: Simplify right side
    89.58x = 9,693.98
  5. Step 5: Solve for x
    x = 9,693.98/89.58
  6. Step 6: Final answer
    x = 108.22

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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.