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Finding the Fourth Proportional to 218.13, 300.99 and 130.78

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Solution

The fourth proportional to 218.13, 300.99 and 130.78 is: 180.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.13 : 300.99 = 130.78 : x
  2. Step 2: Convert to fraction form
    218.13/300.99 = 130.78/x
  3. Step 3: Cross multiply
    218.13x = 300.99 × 130.78
  4. Step 4: Simplify right side
    218.13x = 39,364.34
  5. Step 5: Solve for x
    x = 39,364.34/218.13
  6. Step 6: Final answer
    x = 180.47

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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.