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Finding the Fourth Proportional to 129.99, 195.03 and 57.90

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Solution

The fourth proportional to 129.99, 195.03 and 57.90 is: 86.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.99 : 195.03 = 57.90 : x
  2. Step 2: Convert to fraction form
    129.99/195.03 = 57.90/x
  3. Step 3: Cross multiply
    129.99x = 195.03 × 57.90
  4. Step 4: Simplify right side
    129.99x = 11,292.24
  5. Step 5: Solve for x
    x = 11,292.24/129.99
  6. Step 6: Final answer
    x = 86.87

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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.