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Finding the Fourth Proportional to 143.42, 215.15 and 97.66

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Solution

The fourth proportional to 143.42, 215.15 and 97.66 is: 146.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.42 : 215.15 = 97.66 : x
  2. Step 2: Convert to fraction form
    143.42/215.15 = 97.66/x
  3. Step 3: Cross multiply
    143.42x = 215.15 × 97.66
  4. Step 4: Simplify right side
    143.42x = 21,011.55
  5. Step 5: Solve for x
    x = 21,011.55/143.42
  6. Step 6: Final answer
    x = 146.50

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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.