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Finding the Fourth Proportional to 218.08, 300.93 and 129.55

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Solution

The fourth proportional to 218.08, 300.93 and 129.55 is: 178.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.08 : 300.93 = 129.55 : x
  2. Step 2: Convert to fraction form
    218.08/300.93 = 129.55/x
  3. Step 3: Cross multiply
    218.08x = 300.93 × 129.55
  4. Step 4: Simplify right side
    218.08x = 38,985.48
  5. Step 5: Solve for x
    x = 38,985.48/218.08
  6. Step 6: Final answer
    x = 178.77

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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.