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Finding the Fourth Proportional to 399.36, 598.98 and 193.80

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Solution

The fourth proportional to 399.36, 598.98 and 193.80 is: 290.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.36 : 598.98 = 193.80 : x
  2. Step 2: Convert to fraction form
    399.36/598.98 = 193.80/x
  3. Step 3: Cross multiply
    399.36x = 598.98 × 193.80
  4. Step 4: Simplify right side
    399.36x = 116,082.32
  5. Step 5: Solve for x
    x = 116,082.32/399.36
  6. Step 6: Final answer
    x = 290.67

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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.