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Finding the Fourth Proportional to 143.83, 215.58 and 78.78

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Solution

The fourth proportional to 143.83, 215.58 and 78.78 is: 118.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.83 : 215.58 = 78.78 : x
  2. Step 2: Convert to fraction form
    143.83/215.58 = 78.78/x
  3. Step 3: Cross multiply
    143.83x = 215.58 × 78.78
  4. Step 4: Simplify right side
    143.83x = 16,983.39
  5. Step 5: Solve for x
    x = 16,983.39/143.83
  6. Step 6: Final answer
    x = 118.08

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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.