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Finding the Fourth Proportional to 257.42, 386.10 and 120.32

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Solution

The fourth proportional to 257.42, 386.10 and 120.32 is: 180.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.42 : 386.10 = 120.32 : x
  2. Step 2: Convert to fraction form
    257.42/386.10 = 120.32/x
  3. Step 3: Cross multiply
    257.42x = 386.10 × 120.32
  4. Step 4: Simplify right side
    257.42x = 46,455.55
  5. Step 5: Solve for x
    x = 46,455.55/257.42
  6. Step 6: Final answer
    x = 180.47

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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.