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Finding the Fourth Proportional to 94.87, 130.79 and 76.45

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Solution

The fourth proportional to 94.87, 130.79 and 76.45 is: 105.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.87 : 130.79 = 76.45 : x
  2. Step 2: Convert to fraction form
    94.87/130.79 = 76.45/x
  3. Step 3: Cross multiply
    94.87x = 130.79 × 76.45
  4. Step 4: Simplify right side
    94.87x = 9,998.51
  5. Step 5: Solve for x
    x = 9,998.51/94.87
  6. Step 6: Final answer
    x = 105.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.