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Finding the Fourth Proportional to 76.05, 113.63 and 56.45

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Solution

The fourth proportional to 76.05, 113.63 and 56.45 is: 84.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.05 : 113.63 = 56.45 : x
  2. Step 2: Convert to fraction form
    76.05/113.63 = 56.45/x
  3. Step 3: Cross multiply
    76.05x = 113.63 × 56.45
  4. Step 4: Simplify right side
    76.05x = 6,414.41
  5. Step 5: Solve for x
    x = 6,414.41/76.05
  6. Step 6: Final answer
    x = 84.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.