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Finding the Fourth Proportional to 143.69, 215.55 and 71.46

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Solution

The fourth proportional to 143.69, 215.55 and 71.46 is: 107.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.69 : 215.55 = 71.46 : x
  2. Step 2: Convert to fraction form
    143.69/215.55 = 71.46/x
  3. Step 3: Cross multiply
    143.69x = 215.55 × 71.46
  4. Step 4: Simplify right side
    143.69x = 15,403.20
  5. Step 5: Solve for x
    x = 15,403.20/143.69
  6. Step 6: Final answer
    x = 107.20

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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.