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Finding the Fourth Proportional to 551.79, 761.13 and 355.05

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Solution

The fourth proportional to 551.79, 761.13 and 355.05 is: 489.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.79 : 761.13 = 355.05 : x
  2. Step 2: Convert to fraction form
    551.79/761.13 = 355.05/x
  3. Step 3: Cross multiply
    551.79x = 761.13 × 355.05
  4. Step 4: Simplify right side
    551.79x = 270,239.21
  5. Step 5: Solve for x
    x = 270,239.21/551.79
  6. Step 6: Final answer
    x = 489.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.