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Finding the Fourth Proportional to 399.63, 549.89 and 306.34

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Solution

The fourth proportional to 399.63, 549.89 and 306.34 is: 421.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.63 : 549.89 = 306.34 : x
  2. Step 2: Convert to fraction form
    399.63/549.89 = 306.34/x
  3. Step 3: Cross multiply
    399.63x = 549.89 × 306.34
  4. Step 4: Simplify right side
    399.63x = 168,451.77
  5. Step 5: Solve for x
    x = 168,451.77/399.63
  6. Step 6: Final answer
    x = 421.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.