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Finding the Fourth Proportional to 489.74, 734.78 and 474.26

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Solution

The fourth proportional to 489.74, 734.78 and 474.26 is: 711.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.74 : 734.78 = 474.26 : x
  2. Step 2: Convert to fraction form
    489.74/734.78 = 474.26/x
  3. Step 3: Cross multiply
    489.74x = 734.78 × 474.26
  4. Step 4: Simplify right side
    489.74x = 348,474.27
  5. Step 5: Solve for x
    x = 348,474.27/489.74
  6. Step 6: Final answer
    x = 711.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.