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Finding the Fourth Proportional to 539.78, 808.61 and 308.34

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Solution

The fourth proportional to 539.78, 808.61 and 308.34 is: 461.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.78 : 808.61 = 308.34 : x
  2. Step 2: Convert to fraction form
    539.78/808.61 = 308.34/x
  3. Step 3: Cross multiply
    539.78x = 808.61 × 308.34
  4. Step 4: Simplify right side
    539.78x = 249,325.27
  5. Step 5: Solve for x
    x = 249,325.27/539.78
  6. Step 6: Final answer
    x = 461.91

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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.