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Finding the Fourth Proportional to 551.74, 761.16 and 355.18

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Solution

The fourth proportional to 551.74, 761.16 and 355.18 is: 489.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.74 : 761.16 = 355.18 : x
  2. Step 2: Convert to fraction form
    551.74/761.16 = 355.18/x
  3. Step 3: Cross multiply
    551.74x = 761.16 × 355.18
  4. Step 4: Simplify right side
    551.74x = 270,348.81
  5. Step 5: Solve for x
    x = 270,348.81/551.74
  6. Step 6: Final answer
    x = 489.99

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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.