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Finding the Fourth Proportional to 78.86, 118.20 and 46.35

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Solution

The fourth proportional to 78.86, 118.20 and 46.35 is: 69.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.86 : 118.20 = 46.35 : x
  2. Step 2: Convert to fraction form
    78.86/118.20 = 46.35/x
  3. Step 3: Cross multiply
    78.86x = 118.20 × 46.35
  4. Step 4: Simplify right side
    78.86x = 5,478.63
  5. Step 5: Solve for x
    x = 5,478.63/78.86
  6. Step 6: Final answer
    x = 69.48

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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.