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Finding the Fourth Proportional to 555.10, 765.78 and 356.20

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Solution

The fourth proportional to 555.10, 765.78 and 356.20 is: 491.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.10 : 765.78 = 356.20 : x
  2. Step 2: Convert to fraction form
    555.10/765.78 = 356.20/x
  3. Step 3: Cross multiply
    555.10x = 765.78 × 356.20
  4. Step 4: Simplify right side
    555.10x = 272,770.84
  5. Step 5: Solve for x
    x = 272,770.84/555.10
  6. Step 6: Final answer
    x = 491.39

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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.