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Finding the Fourth Proportional to 659.99, 911.18 and 439.40

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Solution

The fourth proportional to 659.99, 911.18 and 439.40 is: 606.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.99 : 911.18 = 439.40 : x
  2. Step 2: Convert to fraction form
    659.99/911.18 = 439.40/x
  3. Step 3: Cross multiply
    659.99x = 911.18 × 439.40
  4. Step 4: Simplify right side
    659.99x = 400,372.49
  5. Step 5: Solve for x
    x = 400,372.49/659.99
  6. Step 6: Final answer
    x = 606.63

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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.