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Finding the Fourth Proportional to 539.34, 807.21 and 390.48

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Solution

The fourth proportional to 539.34, 807.21 and 390.48 is: 584.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.34 : 807.21 = 390.48 : x
  2. Step 2: Convert to fraction form
    539.34/807.21 = 390.48/x
  3. Step 3: Cross multiply
    539.34x = 807.21 × 390.48
  4. Step 4: Simplify right side
    539.34x = 315,199.36
  5. Step 5: Solve for x
    x = 315,199.36/539.34
  6. Step 6: Final answer
    x = 584.42

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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.