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Finding the Fourth Proportional to 539.20, 808.80 and 475.20

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Solution

The fourth proportional to 539.20, 808.80 and 475.20 is: 712.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.20 : 808.80 = 475.20 : x
  2. Step 2: Convert to fraction form
    539.20/808.80 = 475.20/x
  3. Step 3: Cross multiply
    539.20x = 808.80 × 475.20
  4. Step 4: Simplify right side
    539.20x = 384,341.76
  5. Step 5: Solve for x
    x = 384,341.76/539.20
  6. Step 6: Final answer
    x = 712.80

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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.