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Finding the Fourth Proportional to 393.08, 539.27 and 389.89

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Solution

The fourth proportional to 393.08, 539.27 and 389.89 is: 534.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.08 : 539.27 = 389.89 : x
  2. Step 2: Convert to fraction form
    393.08/539.27 = 389.89/x
  3. Step 3: Cross multiply
    393.08x = 539.27 × 389.89
  4. Step 4: Simplify right side
    393.08x = 210,256.17
  5. Step 5: Solve for x
    x = 210,256.17/393.08
  6. Step 6: Final answer
    x = 534.90

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.