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Finding the Fourth Proportional to 257.62, 386.61 and 103.55

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Solution

The fourth proportional to 257.62, 386.61 and 103.55 is: 155.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.62 : 386.61 = 103.55 : x
  2. Step 2: Convert to fraction form
    257.62/386.61 = 103.55/x
  3. Step 3: Cross multiply
    257.62x = 386.61 × 103.55
  4. Step 4: Simplify right side
    257.62x = 40,032.95
  5. Step 5: Solve for x
    x = 40,032.95/257.62
  6. Step 6: Final answer
    x = 155.40

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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.