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Finding the Fourth Proportional to 539.82, 808.80 and 417.70

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Solution

The fourth proportional to 539.82, 808.80 and 417.70 is: 625.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.82 : 808.80 = 417.70 : x
  2. Step 2: Convert to fraction form
    539.82/808.80 = 417.70/x
  3. Step 3: Cross multiply
    539.82x = 808.80 × 417.70
  4. Step 4: Simplify right side
    539.82x = 337,835.76
  5. Step 5: Solve for x
    x = 337,835.76/539.82
  6. Step 6: Final answer
    x = 625.83

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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.