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Finding the Fourth Proportional to 143.42, 215.12 and 71.32

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Solution

The fourth proportional to 143.42, 215.12 and 71.32 is: 106.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.42 : 215.12 = 71.32 : x
  2. Step 2: Convert to fraction form
    143.42/215.12 = 71.32/x
  3. Step 3: Cross multiply
    143.42x = 215.12 × 71.32
  4. Step 4: Simplify right side
    143.42x = 15,342.36
  5. Step 5: Solve for x
    x = 15,342.36/143.42
  6. Step 6: Final answer
    x = 106.98

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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.