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Finding the Fourth Proportional to 271.60, 407.38 and 76.60

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Solution

The fourth proportional to 271.60, 407.38 and 76.60 is: 114.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.60 : 407.38 = 76.60 : x
  2. Step 2: Convert to fraction form
    271.60/407.38 = 76.60/x
  3. Step 3: Cross multiply
    271.60x = 407.38 × 76.60
  4. Step 4: Simplify right side
    271.60x = 31,203.48
  5. Step 5: Solve for x
    x = 31,203.48/271.60
  6. Step 6: Final answer
    x = 114.89

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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.