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Finding the Fourth Proportional to 439.71, 656.58 and 393.54

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Solution

The fourth proportional to 439.71, 656.58 and 393.54 is: 587.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.71 : 656.58 = 393.54 : x
  2. Step 2: Convert to fraction form
    439.71/656.58 = 393.54/x
  3. Step 3: Cross multiply
    439.71x = 656.58 × 393.54
  4. Step 4: Simplify right side
    439.71x = 258,390.49
  5. Step 5: Solve for x
    x = 258,390.49/439.71
  6. Step 6: Final answer
    x = 587.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.