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Finding the Fourth Proportional to 86, 118.68 and 47.19

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Solution

The fourth proportional to 86, 118.68 and 47.19 is: 65.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    86 : 118.68 = 47.19 : x
  2. Step 2: Convert to fraction form
    86/118.68 = 47.19/x
  3. Step 3: Cross multiply
    86x = 118.68 × 47.19
  4. Step 4: Simplify right side
    86x = 5,600.51
  5. Step 5: Solve for x
    x = 5,600.51/86
  6. Step 6: Final answer
    x = 65.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.