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Finding the Fourth Proportional to 439.08, 605.58 and 389.34

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Solution

The fourth proportional to 439.08, 605.58 and 389.34 is: 536.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.08 : 605.58 = 389.34 : x
  2. Step 2: Convert to fraction form
    439.08/605.58 = 389.34/x
  3. Step 3: Cross multiply
    439.08x = 605.58 × 389.34
  4. Step 4: Simplify right side
    439.08x = 235,776.52
  5. Step 5: Solve for x
    x = 235,776.52/439.08
  6. Step 6: Final answer
    x = 536.98

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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.