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Finding the Fourth Proportional to 555.57, 766.61 and 306.87

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Solution

The fourth proportional to 555.57, 766.61 and 306.87 is: 423.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.57 : 766.61 = 306.87 : x
  2. Step 2: Convert to fraction form
    555.57/766.61 = 306.87/x
  3. Step 3: Cross multiply
    555.57x = 766.61 × 306.87
  4. Step 4: Simplify right side
    555.57x = 235,246.54
  5. Step 5: Solve for x
    x = 235,246.54/555.57
  6. Step 6: Final answer
    x = 423.44

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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.