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Finding the Fourth Proportional to 318.42, 435.66 and 317.22

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Solution

The fourth proportional to 318.42, 435.66 and 317.22 is: 434.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.42 : 435.66 = 317.22 : x
  2. Step 2: Convert to fraction form
    318.42/435.66 = 317.22/x
  3. Step 3: Cross multiply
    318.42x = 435.66 × 317.22
  4. Step 4: Simplify right side
    318.42x = 138,200.07
  5. Step 5: Solve for x
    x = 138,200.07/318.42
  6. Step 6: Final answer
    x = 434.02

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.