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Finding the Fourth Proportional to 556.70, 768.30 and 308.10

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Solution

The fourth proportional to 556.70, 768.30 and 308.10 is: 425.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.70 : 768.30 = 308.10 : x
  2. Step 2: Convert to fraction form
    556.70/768.30 = 308.10/x
  3. Step 3: Cross multiply
    556.70x = 768.30 × 308.10
  4. Step 4: Simplify right side
    556.70x = 236,715.39
  5. Step 5: Solve for x
    x = 236,715.39/556.70
  6. Step 6: Final answer
    x = 425.21

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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.