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Finding the Fourth Proportional to 218.83, 302.05 and 129.18

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Solution

The fourth proportional to 218.83, 302.05 and 129.18 is: 178.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.83 : 302.05 = 129.18 : x
  2. Step 2: Convert to fraction form
    218.83/302.05 = 129.18/x
  3. Step 3: Cross multiply
    218.83x = 302.05 × 129.18
  4. Step 4: Simplify right side
    218.83x = 39,019.63
  5. Step 5: Solve for x
    x = 39,019.63/218.83
  6. Step 6: Final answer
    x = 178.31

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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.