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Finding the Fourth Proportional to 575.22, 857.91 and 489.12

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Solution

The fourth proportional to 575.22, 857.91 and 489.12 is: 729.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.22 : 857.91 = 489.12 : x
  2. Step 2: Convert to fraction form
    575.22/857.91 = 489.12/x
  3. Step 3: Cross multiply
    575.22x = 857.91 × 489.12
  4. Step 4: Simplify right side
    575.22x = 419,620.94
  5. Step 5: Solve for x
    x = 419,620.94/575.22
  6. Step 6: Final answer
    x = 729.50

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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.