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Finding the Fourth Proportional to 555.28, 766.29 and 306.61

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Solution

The fourth proportional to 555.28, 766.29 and 306.61 is: 423.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.28 : 766.29 = 306.61 : x
  2. Step 2: Convert to fraction form
    555.28/766.29 = 306.61/x
  3. Step 3: Cross multiply
    555.28x = 766.29 × 306.61
  4. Step 4: Simplify right side
    555.28x = 234,952.18
  5. Step 5: Solve for x
    x = 234,952.18/555.28
  6. Step 6: Final answer
    x = 423.12

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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.