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Finding the Fourth Proportional to 489.63, 734.32 and 142.88

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Solution

The fourth proportional to 489.63, 734.32 and 142.88 is: 214.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.63 : 734.32 = 142.88 : x
  2. Step 2: Convert to fraction form
    489.63/734.32 = 142.88/x
  3. Step 3: Cross multiply
    489.63x = 734.32 × 142.88
  4. Step 4: Simplify right side
    489.63x = 104,915.97
  5. Step 5: Solve for x
    x = 104,915.97/489.63
  6. Step 6: Final answer
    x = 214.28

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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.