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Finding the Fourth Proportional to 257.15, 354.55 and 210.42

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Solution

The fourth proportional to 257.15, 354.55 and 210.42 is: 290.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.15 : 354.55 = 210.42 : x
  2. Step 2: Convert to fraction form
    257.15/354.55 = 210.42/x
  3. Step 3: Cross multiply
    257.15x = 354.55 × 210.42
  4. Step 4: Simplify right side
    257.15x = 74,604.41
  5. Step 5: Solve for x
    x = 74,604.41/257.15
  6. Step 6: Final answer
    x = 290.12

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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.