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Finding the Fourth Proportional to 78.62, 117.91 and 40.06

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Solution

The fourth proportional to 78.62, 117.91 and 40.06 is: 60.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.62 : 117.91 = 40.06 : x
  2. Step 2: Convert to fraction form
    78.62/117.91 = 40.06/x
  3. Step 3: Cross multiply
    78.62x = 117.91 × 40.06
  4. Step 4: Simplify right side
    78.62x = 4,723.67
  5. Step 5: Solve for x
    x = 4,723.67/78.62
  6. Step 6: Final answer
    x = 60.09

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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.