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Finding the Fourth Proportional to 381.42, 526.29 and 257.28

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Solution

The fourth proportional to 381.42, 526.29 and 257.28 is: 355.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.42 : 526.29 = 257.28 : x
  2. Step 2: Convert to fraction form
    381.42/526.29 = 257.28/x
  3. Step 3: Cross multiply
    381.42x = 526.29 × 257.28
  4. Step 4: Simplify right side
    381.42x = 135,403.89
  5. Step 5: Solve for x
    x = 135,403.89/381.42
  6. Step 6: Final answer
    x = 355.00

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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.