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Finding the Fourth Proportional to 557.10, 768.75 and 308.40

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Solution

The fourth proportional to 557.10, 768.75 and 308.40 is: 425.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.10 : 768.75 = 308.40 : x
  2. Step 2: Convert to fraction form
    557.10/768.75 = 308.40/x
  3. Step 3: Cross multiply
    557.10x = 768.75 × 308.40
  4. Step 4: Simplify right side
    557.10x = 237,082.50
  5. Step 5: Solve for x
    x = 237,082.50/557.10
  6. Step 6: Final answer
    x = 425.57

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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.