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Finding the Fourth Proportional to 130.92, 180.64 and 75.65

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Solution

The fourth proportional to 130.92, 180.64 and 75.65 is: 104.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.92 : 180.64 = 75.65 : x
  2. Step 2: Convert to fraction form
    130.92/180.64 = 75.65/x
  3. Step 3: Cross multiply
    130.92x = 180.64 × 75.65
  4. Step 4: Simplify right side
    130.92x = 13,665.42
  5. Step 5: Solve for x
    x = 13,665.42/130.92
  6. Step 6: Final answer
    x = 104.38

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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.