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Finding the Fourth Proportional to 572.15, 857.39 and 489.39

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Solution

The fourth proportional to 572.15, 857.39 and 489.39 is: 733.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.15 : 857.39 = 489.39 : x
  2. Step 2: Convert to fraction form
    572.15/857.39 = 489.39/x
  3. Step 3: Cross multiply
    572.15x = 857.39 × 489.39
  4. Step 4: Simplify right side
    572.15x = 419,595.65
  5. Step 5: Solve for x
    x = 419,595.65/572.15
  6. Step 6: Final answer
    x = 733.37

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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.