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Finding the Fourth Proportional to 105.18, 158.60 and 89.25

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Solution

The fourth proportional to 105.18, 158.60 and 89.25 is: 134.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.18 : 158.60 = 89.25 : x
  2. Step 2: Convert to fraction form
    105.18/158.60 = 89.25/x
  3. Step 3: Cross multiply
    105.18x = 158.60 × 89.25
  4. Step 4: Simplify right side
    105.18x = 14,154.60
  5. Step 5: Solve for x
    x = 14,154.60/105.18
  6. Step 6: Final answer
    x = 134.58

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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.