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Finding the Fourth Proportional to 218.71, 328.12 and 127.48

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Solution

The fourth proportional to 218.71, 328.12 and 127.48 is: 191.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.71 : 328.12 = 127.48 : x
  2. Step 2: Convert to fraction form
    218.71/328.12 = 127.48/x
  3. Step 3: Cross multiply
    218.71x = 328.12 × 127.48
  4. Step 4: Simplify right side
    218.71x = 41,828.10
  5. Step 5: Solve for x
    x = 41,828.10/218.71
  6. Step 6: Final answer
    x = 191.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.