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Finding the Fourth Proportional to 557.38, 769.18 and 308.69

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Solution

The fourth proportional to 557.38, 769.18 and 308.69 is: 425.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.38 : 769.18 = 308.69 : x
  2. Step 2: Convert to fraction form
    557.38/769.18 = 308.69/x
  3. Step 3: Cross multiply
    557.38x = 769.18 × 308.69
  4. Step 4: Simplify right side
    557.38x = 237,435.83
  5. Step 5: Solve for x
    x = 237,435.83/557.38
  6. Step 6: Final answer
    x = 425.98

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1.5x scale

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.