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Finding the Fourth Proportional to 551.20, 760.88 and 354.72

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Solution

The fourth proportional to 551.20, 760.88 and 354.72 is: 489.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.20 : 760.88 = 354.72 : x
  2. Step 2: Convert to fraction form
    551.20/760.88 = 354.72/x
  3. Step 3: Cross multiply
    551.20x = 760.88 × 354.72
  4. Step 4: Simplify right side
    551.20x = 269,899.35
  5. Step 5: Solve for x
    x = 269,899.35/551.20
  6. Step 6: Final answer
    x = 489.66

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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.