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Finding the Fourth Proportional to 561, 773.44 and 490.42

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Solution

The fourth proportional to 561, 773.44 and 490.42 is: 676.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    561 : 773.44 = 490.42 : x
  2. Step 2: Convert to fraction form
    561/773.44 = 490.42/x
  3. Step 3: Cross multiply
    561x = 773.44 × 490.42
  4. Step 4: Simplify right side
    561x = 379,307.29
  5. Step 5: Solve for x
    x = 379,307.29/561
  6. Step 6: Final answer
    x = 676.13

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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.