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Finding the Fourth Proportional to 557.50, 769.32 and 308.80

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Solution

The fourth proportional to 557.50, 769.32 and 308.80 is: 426.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.50 : 769.32 = 308.80 : x
  2. Step 2: Convert to fraction form
    557.50/769.32 = 308.80/x
  3. Step 3: Cross multiply
    557.50x = 769.32 × 308.80
  4. Step 4: Simplify right side
    557.50x = 237,566.02
  5. Step 5: Solve for x
    x = 237,566.02/557.50
  6. Step 6: Final answer
    x = 426.13

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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.