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Finding the Fourth Proportional to 489.69, 734.51 and 215.71

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Solution

The fourth proportional to 489.69, 734.51 and 215.71 is: 323.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.69 : 734.51 = 215.71 : x
  2. Step 2: Convert to fraction form
    489.69/734.51 = 215.71/x
  3. Step 3: Cross multiply
    489.69x = 734.51 × 215.71
  4. Step 4: Simplify right side
    489.69x = 158,439.86
  5. Step 5: Solve for x
    x = 158,439.86/489.69
  6. Step 6: Final answer
    x = 323.55

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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.