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Finding the Fourth Proportional to 257.28, 355.06 and 152.42

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Solution

The fourth proportional to 257.28, 355.06 and 152.42 is: 210.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.28 : 355.06 = 152.42 : x
  2. Step 2: Convert to fraction form
    257.28/355.06 = 152.42/x
  3. Step 3: Cross multiply
    257.28x = 355.06 × 152.42
  4. Step 4: Simplify right side
    257.28x = 54,118.75
  5. Step 5: Solve for x
    x = 54,118.75/257.28
  6. Step 6: Final answer
    x = 210.35

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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.