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Finding the Fourth Proportional to 76.39, 114.45 and 55.99

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Solution

The fourth proportional to 76.39, 114.45 and 55.99 is: 83.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.39 : 114.45 = 55.99 : x
  2. Step 2: Convert to fraction form
    76.39/114.45 = 55.99/x
  3. Step 3: Cross multiply
    76.39x = 114.45 × 55.99
  4. Step 4: Simplify right side
    76.39x = 6,408.06
  5. Step 5: Solve for x
    x = 6,408.06/76.39
  6. Step 6: Final answer
    x = 83.89

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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.