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Finding the Fourth Proportional to 129.02, 193.61 and 51.99

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Solution

The fourth proportional to 129.02, 193.61 and 51.99 is: 78.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.02 : 193.61 = 51.99 : x
  2. Step 2: Convert to fraction form
    129.02/193.61 = 51.99/x
  3. Step 3: Cross multiply
    129.02x = 193.61 × 51.99
  4. Step 4: Simplify right side
    129.02x = 10,065.78
  5. Step 5: Solve for x
    x = 10,065.78/129.02
  6. Step 6: Final answer
    x = 78.02

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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.