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Finding the Fourth Proportional to 489.30, 733.52 and 215.18

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Solution

The fourth proportional to 489.30, 733.52 and 215.18 is: 322.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.30 : 733.52 = 215.18 : x
  2. Step 2: Convert to fraction form
    489.30/733.52 = 215.18/x
  3. Step 3: Cross multiply
    489.30x = 733.52 × 215.18
  4. Step 4: Simplify right side
    489.30x = 157,838.83
  5. Step 5: Solve for x
    x = 157,838.83/489.30
  6. Step 6: Final answer
    x = 322.58

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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.