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Finding the Fourth Proportional to 373.42, 515.28 and 218.20

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Solution

The fourth proportional to 373.42, 515.28 and 218.20 is: 301.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    373.42 : 515.28 = 218.20 : x
  2. Step 2: Convert to fraction form
    373.42/515.28 = 218.20/x
  3. Step 3: Cross multiply
    373.42x = 515.28 × 218.20
  4. Step 4: Simplify right side
    373.42x = 112,434.10
  5. Step 5: Solve for x
    x = 112,434.10/373.42
  6. Step 6: Final answer
    x = 301.09

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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.