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Finding the Fourth Proportional to 218.17, 301.31 and 152.56

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Solution

The fourth proportional to 218.17, 301.31 and 152.56 is: 210.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.17 : 301.31 = 152.56 : x
  2. Step 2: Convert to fraction form
    218.17/301.31 = 152.56/x
  3. Step 3: Cross multiply
    218.17x = 301.31 × 152.56
  4. Step 4: Simplify right side
    218.17x = 45,966.34
  5. Step 5: Solve for x
    x = 45,966.34/218.17
  6. Step 6: Final answer
    x = 210.69

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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.