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Finding the Fourth Proportional to 555.80, 763.94 and 489.92

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Solution

The fourth proportional to 555.80, 763.94 and 489.92 is: 673.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.80 : 763.94 = 489.92 : x
  2. Step 2: Convert to fraction form
    555.80/763.94 = 489.92/x
  3. Step 3: Cross multiply
    555.80x = 763.94 × 489.92
  4. Step 4: Simplify right side
    555.80x = 374,269.48
  5. Step 5: Solve for x
    x = 374,269.48/555.80
  6. Step 6: Final answer
    x = 673.39

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.