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Finding the Fourth Proportional to 143.18, 214.70 and 78.17

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Solution

The fourth proportional to 143.18, 214.70 and 78.17 is: 117.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.18 : 214.70 = 78.17 : x
  2. Step 2: Convert to fraction form
    143.18/214.70 = 78.17/x
  3. Step 3: Cross multiply
    143.18x = 214.70 × 78.17
  4. Step 4: Simplify right side
    143.18x = 16,781.63
  5. Step 5: Solve for x
    x = 16,781.63/143.18
  6. Step 6: Final answer
    x = 117.21

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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.