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Finding the Fourth Proportional to 557.03, 768.71 and 308.35

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Solution

The fourth proportional to 557.03, 768.71 and 308.35 is: 425.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.03 : 768.71 = 308.35 : x
  2. Step 2: Convert to fraction form
    557.03/768.71 = 308.35/x
  3. Step 3: Cross multiply
    557.03x = 768.71 × 308.35
  4. Step 4: Simplify right side
    557.03x = 237,033.46
  5. Step 5: Solve for x
    x = 237,033.46/557.03
  6. Step 6: Final answer
    x = 425.53

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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.