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Finding the Fourth Proportional to 575.31, 857.99 and 489.20

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Solution

The fourth proportional to 575.31, 857.99 and 489.20 is: 729.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.31 : 857.99 = 489.20 : x
  2. Step 2: Convert to fraction form
    575.31/857.99 = 489.20/x
  3. Step 3: Cross multiply
    575.31x = 857.99 × 489.20
  4. Step 4: Simplify right side
    575.31x = 419,725.64
  5. Step 5: Solve for x
    x = 419,725.64/575.31
  6. Step 6: Final answer
    x = 729.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.