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Finding the Fourth Proportional to 397.83, 547.87 and 389.35

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Solution

The fourth proportional to 397.83, 547.87 and 389.35 is: 536.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.83 : 547.87 = 389.35 : x
  2. Step 2: Convert to fraction form
    397.83/547.87 = 389.35/x
  3. Step 3: Cross multiply
    397.83x = 547.87 × 389.35
  4. Step 4: Simplify right side
    397.83x = 213,313.18
  5. Step 5: Solve for x
    x = 213,313.18/397.83
  6. Step 6: Final answer
    x = 536.19

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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.