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Finding the Fourth Proportional to 373.78, 515.85 and 218.50

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Solution

The fourth proportional to 373.78, 515.85 and 218.50 is: 301.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    373.78 : 515.85 = 218.50 : x
  2. Step 2: Convert to fraction form
    373.78/515.85 = 218.50/x
  3. Step 3: Cross multiply
    373.78x = 515.85 × 218.50
  4. Step 4: Simplify right side
    373.78x = 112,713.23
  5. Step 5: Solve for x
    x = 112,713.23/373.78
  6. Step 6: Final answer
    x = 301.55

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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.