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Finding the Fourth Proportional to 143.69, 215.71 and 105.42

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Solution

The fourth proportional to 143.69, 215.71 and 105.42 is: 158.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.69 : 215.71 = 105.42 : x
  2. Step 2: Convert to fraction form
    143.69/215.71 = 105.42/x
  3. Step 3: Cross multiply
    143.69x = 215.71 × 105.42
  4. Step 4: Simplify right side
    143.69x = 22,740.07
  5. Step 5: Solve for x
    x = 22,740.07/143.69
  6. Step 6: Final answer
    x = 158.26

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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.