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Finding the Fourth Proportional to 551.76, 827.64 and 479.76

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Solution

The fourth proportional to 551.76, 827.64 and 479.76 is: 719.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.76 : 827.64 = 479.76 : x
  2. Step 2: Convert to fraction form
    551.76/827.64 = 479.76/x
  3. Step 3: Cross multiply
    551.76x = 827.64 × 479.76
  4. Step 4: Simplify right side
    551.76x = 397,068.57
  5. Step 5: Solve for x
    x = 397,068.57/551.76
  6. Step 6: Final answer
    x = 719.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.