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Finding the Fourth Proportional to 257.15, 385.69 and 72.07

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Solution

The fourth proportional to 257.15, 385.69 and 72.07 is: 108.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.15 : 385.69 = 72.07 : x
  2. Step 2: Convert to fraction form
    257.15/385.69 = 72.07/x
  3. Step 3: Cross multiply
    257.15x = 385.69 × 72.07
  4. Step 4: Simplify right side
    257.15x = 27,796.68
  5. Step 5: Solve for x
    x = 27,796.68/257.15
  6. Step 6: Final answer
    x = 108.10

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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.