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Finding the Fourth Proportional to 257.60, 386.40 and 65.22

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Solution

The fourth proportional to 257.60, 386.40 and 65.22 is: 97.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.60 : 386.40 = 65.22 : x
  2. Step 2: Convert to fraction form
    257.60/386.40 = 65.22/x
  3. Step 3: Cross multiply
    257.60x = 386.40 × 65.22
  4. Step 4: Simplify right side
    257.60x = 25,201.01
  5. Step 5: Solve for x
    x = 25,201.01/257.60
  6. Step 6: Final answer
    x = 97.83

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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.