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Finding the Fourth Proportional to 218.08, 300.32 and 155.92

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Solution

The fourth proportional to 218.08, 300.32 and 155.92 is: 214.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.08 : 300.32 = 155.92 : x
  2. Step 2: Convert to fraction form
    218.08/300.32 = 155.92/x
  3. Step 3: Cross multiply
    218.08x = 300.32 × 155.92
  4. Step 4: Simplify right side
    218.08x = 46,825.89
  5. Step 5: Solve for x
    x = 46,825.89/218.08
  6. Step 6: Final answer
    x = 214.72

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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.