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Finding the Fourth Proportional to 555.78, 766.86 and 319.68

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Solution

The fourth proportional to 555.78, 766.86 and 319.68 is: 441.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.78 : 766.86 = 319.68 : x
  2. Step 2: Convert to fraction form
    555.78/766.86 = 319.68/x
  3. Step 3: Cross multiply
    555.78x = 766.86 × 319.68
  4. Step 4: Simplify right side
    555.78x = 245,149.80
  5. Step 5: Solve for x
    x = 245,149.80/555.78
  6. Step 6: Final answer
    x = 441.09

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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.