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Finding the Fourth Proportional to 399.81, 599.78 and 125.85

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Solution

The fourth proportional to 399.81, 599.78 and 125.85 is: 188.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.81 : 599.78 = 125.85 : x
  2. Step 2: Convert to fraction form
    399.81/599.78 = 125.85/x
  3. Step 3: Cross multiply
    399.81x = 599.78 × 125.85
  4. Step 4: Simplify right side
    399.81x = 75,482.31
  5. Step 5: Solve for x
    x = 75,482.31/399.81
  6. Step 6: Final answer
    x = 188.80

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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.