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Finding the Fourth Proportional to 382.19, 526.81 and 257.81

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Solution

The fourth proportional to 382.19, 526.81 and 257.81 is: 355.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.19 : 526.81 = 257.81 : x
  2. Step 2: Convert to fraction form
    382.19/526.81 = 257.81/x
  3. Step 3: Cross multiply
    382.19x = 526.81 × 257.81
  4. Step 4: Simplify right side
    382.19x = 135,816.24
  5. Step 5: Solve for x
    x = 135,816.24/382.19
  6. Step 6: Final answer
    x = 355.36

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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.