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Finding the Fourth Proportional to 130.76, 195.70 and 100.16

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Solution

The fourth proportional to 130.76, 195.70 and 100.16 is: 149.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.76 : 195.70 = 100.16 : x
  2. Step 2: Convert to fraction form
    130.76/195.70 = 100.16/x
  3. Step 3: Cross multiply
    130.76x = 195.70 × 100.16
  4. Step 4: Simplify right side
    130.76x = 19,601.31
  5. Step 5: Solve for x
    x = 19,601.31/130.76
  6. Step 6: Final answer
    x = 149.90

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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.