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Finding the Fourth Proportional to 130.64, 196.02 and 66.50

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Solution

The fourth proportional to 130.64, 196.02 and 66.50 is: 99.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.64 : 196.02 = 66.50 : x
  2. Step 2: Convert to fraction form
    130.64/196.02 = 66.50/x
  3. Step 3: Cross multiply
    130.64x = 196.02 × 66.50
  4. Step 4: Simplify right side
    130.64x = 13,035.33
  5. Step 5: Solve for x
    x = 13,035.33/130.64
  6. Step 6: Final answer
    x = 99.78

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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.