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Finding the Fourth Proportional to 402.50, 555.45 and 218.50

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Solution

The fourth proportional to 402.50, 555.45 and 218.50 is: 301.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.50 : 555.45 = 218.50 : x
  2. Step 2: Convert to fraction form
    402.50/555.45 = 218.50/x
  3. Step 3: Cross multiply
    402.50x = 555.45 × 218.50
  4. Step 4: Simplify right side
    402.50x = 121,365.83
  5. Step 5: Solve for x
    x = 121,365.83/402.50
  6. Step 6: Final answer
    x = 301.53

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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.