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Finding the Fourth Proportional to 257.67, 386.54 and 75.07

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Solution

The fourth proportional to 257.67, 386.54 and 75.07 is: 112.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.67 : 386.54 = 75.07 : x
  2. Step 2: Convert to fraction form
    257.67/386.54 = 75.07/x
  3. Step 3: Cross multiply
    257.67x = 386.54 × 75.07
  4. Step 4: Simplify right side
    257.67x = 29,017.60
  5. Step 5: Solve for x
    x = 29,017.60/257.67
  6. Step 6: Final answer
    x = 112.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.