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Finding the Fourth Proportional to 76.60, 114.72 and 53.68

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Solution

The fourth proportional to 76.60, 114.72 and 53.68 is: 80.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.60 : 114.72 = 53.68 : x
  2. Step 2: Convert to fraction form
    76.60/114.72 = 53.68/x
  3. Step 3: Cross multiply
    76.60x = 114.72 × 53.68
  4. Step 4: Simplify right side
    76.60x = 6,158.17
  5. Step 5: Solve for x
    x = 6,158.17/76.60
  6. Step 6: Final answer
    x = 80.39

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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.