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Finding the Fourth Proportional to 143.53, 215.09 and 78.48

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Solution

The fourth proportional to 143.53, 215.09 and 78.48 is: 117.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.53 : 215.09 = 78.48 : x
  2. Step 2: Convert to fraction form
    143.53/215.09 = 78.48/x
  3. Step 3: Cross multiply
    143.53x = 215.09 × 78.48
  4. Step 4: Simplify right side
    143.53x = 16,880.26
  5. Step 5: Solve for x
    x = 16,880.26/143.53
  6. Step 6: Final answer
    x = 117.61

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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.