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Finding the Fourth Proportional to 551.15, 822.46 and 489.79

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Solution

The fourth proportional to 551.15, 822.46 and 489.79 is: 730.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.15 : 822.46 = 489.79 : x
  2. Step 2: Convert to fraction form
    551.15/822.46 = 489.79/x
  3. Step 3: Cross multiply
    551.15x = 822.46 × 489.79
  4. Step 4: Simplify right side
    551.15x = 402,829.40
  5. Step 5: Solve for x
    x = 402,829.40/551.15
  6. Step 6: Final answer
    x = 730.90

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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.