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Finding the Fourth Proportional to 555.47, 766.55 and 306.80

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Solution

The fourth proportional to 555.47, 766.55 and 306.80 is: 423.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.47 : 766.55 = 306.80 : x
  2. Step 2: Convert to fraction form
    555.47/766.55 = 306.80/x
  3. Step 3: Cross multiply
    555.47x = 766.55 × 306.80
  4. Step 4: Simplify right side
    555.47x = 235,177.54
  5. Step 5: Solve for x
    x = 235,177.54/555.47
  6. Step 6: Final answer
    x = 423.38

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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.