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Finding the Fourth Proportional to 382.92, 528.63 and 258.78

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Solution

The fourth proportional to 382.92, 528.63 and 258.78 is: 357.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.92 : 528.63 = 258.78 : x
  2. Step 2: Convert to fraction form
    382.92/528.63 = 258.78/x
  3. Step 3: Cross multiply
    382.92x = 528.63 × 258.78
  4. Step 4: Simplify right side
    382.92x = 136,798.87
  5. Step 5: Solve for x
    x = 136,798.87/382.92
  6. Step 6: Final answer
    x = 357.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.