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Finding the Fourth Proportional to 143.19, 214.45 and 78.03

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Solution

The fourth proportional to 143.19, 214.45 and 78.03 is: 116.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.19 : 214.45 = 78.03 : x
  2. Step 2: Convert to fraction form
    143.19/214.45 = 78.03/x
  3. Step 3: Cross multiply
    143.19x = 214.45 × 78.03
  4. Step 4: Simplify right side
    143.19x = 16,734.14
  5. Step 5: Solve for x
    x = 16,734.14/143.19
  6. Step 6: Final answer
    x = 116.86

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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.