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Finding the Fourth Proportional to 355, 531.30 and 218.14

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Solution

The fourth proportional to 355, 531.30 and 218.14 is: 326.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    355 : 531.30 = 218.14 : x
  2. Step 2: Convert to fraction form
    355/531.30 = 218.14/x
  3. Step 3: Cross multiply
    355x = 531.30 × 218.14
  4. Step 4: Simplify right side
    355x = 115,897.78
  5. Step 5: Solve for x
    x = 115,897.78/355
  6. Step 6: Final answer
    x = 326.47

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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.