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Finding the Fourth Proportional to 509.31, 701.33 and 398.54

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Solution

The fourth proportional to 509.31, 701.33 and 398.54 is: 548.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.31 : 701.33 = 398.54 : x
  2. Step 2: Convert to fraction form
    509.31/701.33 = 398.54/x
  3. Step 3: Cross multiply
    509.31x = 701.33 × 398.54
  4. Step 4: Simplify right side
    509.31x = 279,507.82
  5. Step 5: Solve for x
    x = 279,507.82/509.31
  6. Step 6: Final answer
    x = 548.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.