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Finding the Fourth Proportional to 557.53, 769.40 and 308.84

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Solution

The fourth proportional to 557.53, 769.40 and 308.84 is: 426.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.53 : 769.40 = 308.84 : x
  2. Step 2: Convert to fraction form
    557.53/769.40 = 308.84/x
  3. Step 3: Cross multiply
    557.53x = 769.40 × 308.84
  4. Step 4: Simplify right side
    557.53x = 237,619.43
  5. Step 5: Solve for x
    x = 237,619.43/557.53
  6. Step 6: Final answer
    x = 426.20

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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.