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Finding the Fourth Proportional to 406.74, 561.38 and 318.04

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Solution

The fourth proportional to 406.74, 561.38 and 318.04 is: 438.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.74 : 561.38 = 318.04 : x
  2. Step 2: Convert to fraction form
    406.74/561.38 = 318.04/x
  3. Step 3: Cross multiply
    406.74x = 561.38 × 318.04
  4. Step 4: Simplify right side
    406.74x = 178,543.25
  5. Step 5: Solve for x
    x = 178,543.25/406.74
  6. Step 6: Final answer
    x = 438.96

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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.