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Finding the Fourth Proportional to 78.93, 118.39 and 40.40

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Solution

The fourth proportional to 78.93, 118.39 and 40.40 is: 60.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.93 : 118.39 = 40.40 : x
  2. Step 2: Convert to fraction form
    78.93/118.39 = 40.40/x
  3. Step 3: Cross multiply
    78.93x = 118.39 × 40.40
  4. Step 4: Simplify right side
    78.93x = 4,782.16
  5. Step 5: Solve for x
    x = 4,782.16/78.93
  6. Step 6: Final answer
    x = 60.59

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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.