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Finding the Fourth Proportional to 143.61, 215.45 and 78.63

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Solution

The fourth proportional to 143.61, 215.45 and 78.63 is: 117.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.61 : 215.45 = 78.63 : x
  2. Step 2: Convert to fraction form
    143.61/215.45 = 78.63/x
  3. Step 3: Cross multiply
    143.61x = 215.45 × 78.63
  4. Step 4: Simplify right side
    143.61x = 16,940.44
  5. Step 5: Solve for x
    x = 16,940.44/143.61
  6. Step 6: Final answer
    x = 117.96

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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.