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Finding the Fourth Proportional to 130.45, 179.99 and 77.28

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Solution

The fourth proportional to 130.45, 179.99 and 77.28 is: 106.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.45 : 179.99 = 77.28 : x
  2. Step 2: Convert to fraction form
    130.45/179.99 = 77.28/x
  3. Step 3: Cross multiply
    130.45x = 179.99 × 77.28
  4. Step 4: Simplify right side
    130.45x = 13,908.73
  5. Step 5: Solve for x
    x = 13,908.73/130.45
  6. Step 6: Final answer
    x = 106.63

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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.