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Finding the Fourth Proportional to 557.55, 769.32 and 308.79

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Solution

The fourth proportional to 557.55, 769.32 and 308.79 is: 426.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.55 : 769.32 = 308.79 : x
  2. Step 2: Convert to fraction form
    557.55/769.32 = 308.79/x
  3. Step 3: Cross multiply
    557.55x = 769.32 × 308.79
  4. Step 4: Simplify right side
    557.55x = 237,558.32
  5. Step 5: Solve for x
    x = 237,558.32/557.55
  6. Step 6: Final answer
    x = 426.08

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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.