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Finding the Fourth Proportional to 76.16, 114.28 and 40.09

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Solution

The fourth proportional to 76.16, 114.28 and 40.09 is: 60.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.16 : 114.28 = 40.09 : x
  2. Step 2: Convert to fraction form
    76.16/114.28 = 40.09/x
  3. Step 3: Cross multiply
    76.16x = 114.28 × 40.09
  4. Step 4: Simplify right side
    76.16x = 4,581.49
  5. Step 5: Solve for x
    x = 4,581.49/76.16
  6. Step 6: Final answer
    x = 60.16

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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.