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Finding the Fourth Proportional to 389, 536.72 and 306.10

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Solution

The fourth proportional to 389, 536.72 and 306.10 is: 422.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    389 : 536.72 = 306.10 : x
  2. Step 2: Convert to fraction form
    389/536.72 = 306.10/x
  3. Step 3: Cross multiply
    389x = 536.72 × 306.10
  4. Step 4: Simplify right side
    389x = 164,289.99
  5. Step 5: Solve for x
    x = 164,289.99/389
  6. Step 6: Final answer
    x = 422.34

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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.