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Finding the Fourth Proportional to 538.74, 808.20 and 278.91

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Solution

The fourth proportional to 538.74, 808.20 and 278.91 is: 418.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.74 : 808.20 = 278.91 : x
  2. Step 2: Convert to fraction form
    538.74/808.20 = 278.91/x
  3. Step 3: Cross multiply
    538.74x = 808.20 × 278.91
  4. Step 4: Simplify right side
    538.74x = 225,415.06
  5. Step 5: Solve for x
    x = 225,415.06/538.74
  6. Step 6: Final answer
    x = 418.41

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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.