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Finding the Fourth Proportional to 539.64, 810.20 and 279.82

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Solution

The fourth proportional to 539.64, 810.20 and 279.82 is: 420.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.64 : 810.20 = 279.82 : x
  2. Step 2: Convert to fraction form
    539.64/810.20 = 279.82/x
  3. Step 3: Cross multiply
    539.64x = 810.20 × 279.82
  4. Step 4: Simplify right side
    539.64x = 226,710.16
  5. Step 5: Solve for x
    x = 226,710.16/539.64
  6. Step 6: Final answer
    x = 420.11

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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.