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Finding the Fourth Proportional to 557.45, 768.78 and 446.90

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Solution

The fourth proportional to 557.45, 768.78 and 446.90 is: 616.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.45 : 768.78 = 446.90 : x
  2. Step 2: Convert to fraction form
    557.45/768.78 = 446.90/x
  3. Step 3: Cross multiply
    557.45x = 768.78 × 446.90
  4. Step 4: Simplify right side
    557.45x = 343,567.78
  5. Step 5: Solve for x
    x = 343,567.78/557.45
  6. Step 6: Final answer
    x = 616.32

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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.