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Finding the Fourth Proportional to 555.81, 828.82 and 518.11

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Solution

The fourth proportional to 555.81, 828.82 and 518.11 is: 772.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.81 : 828.82 = 518.11 : x
  2. Step 2: Convert to fraction form
    555.81/828.82 = 518.11/x
  3. Step 3: Cross multiply
    555.81x = 828.82 × 518.11
  4. Step 4: Simplify right side
    555.81x = 429,420.25
  5. Step 5: Solve for x
    x = 429,420.25/555.81
  6. Step 6: Final answer
    x = 772.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.