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Finding the Fourth Proportional to 143.60, 215.47 and 109.58

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Solution

The fourth proportional to 143.60, 215.47 and 109.58 is: 164.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.60 : 215.47 = 109.58 : x
  2. Step 2: Convert to fraction form
    143.60/215.47 = 109.58/x
  3. Step 3: Cross multiply
    143.60x = 215.47 × 109.58
  4. Step 4: Simplify right side
    143.60x = 23,609.85
  5. Step 5: Solve for x
    x = 23,609.85/143.60
  6. Step 6: Final answer
    x = 164.42

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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.