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Finding the Fourth Proportional to 489.64, 734.16 and 258.39

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Solution

The fourth proportional to 489.64, 734.16 and 258.39 is: 387.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.64 : 734.16 = 258.39 : x
  2. Step 2: Convert to fraction form
    489.64/734.16 = 258.39/x
  3. Step 3: Cross multiply
    489.64x = 734.16 × 258.39
  4. Step 4: Simplify right side
    489.64x = 189,694.64
  5. Step 5: Solve for x
    x = 189,694.64/489.64
  6. Step 6: Final answer
    x = 387.42

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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.