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Finding the Fourth Proportional to 555.64, 766.78 and 306.95

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Solution

The fourth proportional to 555.64, 766.78 and 306.95 is: 423.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.64 : 766.78 = 306.95 : x
  2. Step 2: Convert to fraction form
    555.64/766.78 = 306.95/x
  3. Step 3: Cross multiply
    555.64x = 766.78 × 306.95
  4. Step 4: Simplify right side
    555.64x = 235,363.12
  5. Step 5: Solve for x
    x = 235,363.12/555.64
  6. Step 6: Final answer
    x = 423.59

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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.