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Finding the Fourth Proportional to 557.51, 769.47 and 321.61

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Solution

The fourth proportional to 557.51, 769.47 and 321.61 is: 443.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.51 : 769.47 = 321.61 : x
  2. Step 2: Convert to fraction form
    557.51/769.47 = 321.61/x
  3. Step 3: Cross multiply
    557.51x = 769.47 × 321.61
  4. Step 4: Simplify right side
    557.51x = 247,466.92
  5. Step 5: Solve for x
    x = 247,466.92/557.51
  6. Step 6: Final answer
    x = 443.88

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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.