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Finding the Fourth Proportional to 216.64, 298.96 and 118.40

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Solution

The fourth proportional to 216.64, 298.96 and 118.40 is: 163.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.64 : 298.96 = 118.40 : x
  2. Step 2: Convert to fraction form
    216.64/298.96 = 118.40/x
  3. Step 3: Cross multiply
    216.64x = 298.96 × 118.40
  4. Step 4: Simplify right side
    216.64x = 35,396.86
  5. Step 5: Solve for x
    x = 35,396.86/216.64
  6. Step 6: Final answer
    x = 163.39

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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.