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Finding the Fourth Proportional to 489, 737.28 and 393.96

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Solution

The fourth proportional to 489, 737.28 and 393.96 is: 593.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 737.28 = 393.96 : x
  2. Step 2: Convert to fraction form
    489/737.28 = 393.96/x
  3. Step 3: Cross multiply
    489x = 737.28 × 393.96
  4. Step 4: Simplify right side
    489x = 290,458.83
  5. Step 5: Solve for x
    x = 290,458.83/489
  6. Step 6: Final answer
    x = 593.99

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.