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Finding the Fourth Proportional to 551.91, 758.52 and 489.36

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Solution

The fourth proportional to 551.91, 758.52 and 489.36 is: 672.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.91 : 758.52 = 489.36 : x
  2. Step 2: Convert to fraction form
    551.91/758.52 = 489.36/x
  3. Step 3: Cross multiply
    551.91x = 758.52 × 489.36
  4. Step 4: Simplify right side
    551.91x = 371,189.35
  5. Step 5: Solve for x
    x = 371,189.35/551.91
  6. Step 6: Final answer
    x = 672.55

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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.