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Finding the Fourth Proportional to 76.40, 114.64 and 72.60

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Solution

The fourth proportional to 76.40, 114.64 and 72.60 is: 108.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.40 : 114.64 = 72.60 : x
  2. Step 2: Convert to fraction form
    76.40/114.64 = 72.60/x
  3. Step 3: Cross multiply
    76.40x = 114.64 × 72.60
  4. Step 4: Simplify right side
    76.40x = 8,322.86
  5. Step 5: Solve for x
    x = 8,322.86/76.40
  6. Step 6: Final answer
    x = 108.94

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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.