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Finding the Fourth Proportional to 257.55, 355.58 and 187.83

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Solution

The fourth proportional to 257.55, 355.58 and 187.83 is: 259.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.55 : 355.58 = 187.83 : x
  2. Step 2: Convert to fraction form
    257.55/355.58 = 187.83/x
  3. Step 3: Cross multiply
    257.55x = 355.58 × 187.83
  4. Step 4: Simplify right side
    257.55x = 66,787.65
  5. Step 5: Solve for x
    x = 66,787.65/257.55
  6. Step 6: Final answer
    x = 259.32

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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.