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Finding the Fourth Proportional to 555.31, 766.31 and 306.64

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Solution

The fourth proportional to 555.31, 766.31 and 306.64 is: 423.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.31 : 766.31 = 306.64 : x
  2. Step 2: Convert to fraction form
    555.31/766.31 = 306.64/x
  3. Step 3: Cross multiply
    555.31x = 766.31 × 306.64
  4. Step 4: Simplify right side
    555.31x = 234,982.45
  5. Step 5: Solve for x
    x = 234,982.45/555.31
  6. Step 6: Final answer
    x = 423.16

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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.