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Finding the Fourth Proportional to 95.90, 143.62 and 78.66

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Solution

The fourth proportional to 95.90, 143.62 and 78.66 is: 117.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.90 : 143.62 = 78.66 : x
  2. Step 2: Convert to fraction form
    95.90/143.62 = 78.66/x
  3. Step 3: Cross multiply
    95.90x = 143.62 × 78.66
  4. Step 4: Simplify right side
    95.90x = 11,297.15
  5. Step 5: Solve for x
    x = 11,297.15/95.90
  6. Step 6: Final answer
    x = 117.80

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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.