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Finding the Fourth Proportional to 318.79, 439.26 and 302.32

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Solution

The fourth proportional to 318.79, 439.26 and 302.32 is: 416.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.79 : 439.26 = 302.32 : x
  2. Step 2: Convert to fraction form
    318.79/439.26 = 302.32/x
  3. Step 3: Cross multiply
    318.79x = 439.26 × 302.32
  4. Step 4: Simplify right side
    318.79x = 132,797.08
  5. Step 5: Solve for x
    x = 132,797.08/318.79
  6. Step 6: Final answer
    x = 416.57

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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.