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Finding the Fourth Proportional to 257.12, 354.76 and 187.20

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Solution

The fourth proportional to 257.12, 354.76 and 187.20 is: 258.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.12 : 354.76 = 187.20 : x
  2. Step 2: Convert to fraction form
    257.12/354.76 = 187.20/x
  3. Step 3: Cross multiply
    257.12x = 354.76 × 187.20
  4. Step 4: Simplify right side
    257.12x = 66,411.07
  5. Step 5: Solve for x
    x = 66,411.07/257.12
  6. Step 6: Final answer
    x = 258.29

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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.