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Finding the Fourth Proportional to 130.21, 195.01 and 78.77

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Solution

The fourth proportional to 130.21, 195.01 and 78.77 is: 117.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.21 : 195.01 = 78.77 : x
  2. Step 2: Convert to fraction form
    130.21/195.01 = 78.77/x
  3. Step 3: Cross multiply
    130.21x = 195.01 × 78.77
  4. Step 4: Simplify right side
    130.21x = 15,361.23
  5. Step 5: Solve for x
    x = 15,361.23/130.21
  6. Step 6: Final answer
    x = 117.97

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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.