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Finding the Fourth Proportional to 130.50, 195.81 and 87.15

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Solution

The fourth proportional to 130.50, 195.81 and 87.15 is: 130.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.50 : 195.81 = 87.15 : x
  2. Step 2: Convert to fraction form
    130.50/195.81 = 87.15/x
  3. Step 3: Cross multiply
    130.50x = 195.81 × 87.15
  4. Step 4: Simplify right side
    130.50x = 17,064.84
  5. Step 5: Solve for x
    x = 17,064.84/130.50
  6. Step 6: Final answer
    x = 130.77

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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.