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Finding the Fourth Proportional to 317.16, 435 and 311.88

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Solution

The fourth proportional to 317.16, 435 and 311.88 is: 427.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.16 : 435 = 311.88 : x
  2. Step 2: Convert to fraction form
    317.16/435 = 311.88/x
  3. Step 3: Cross multiply
    317.16x = 435 × 311.88
  4. Step 4: Simplify right side
    317.16x = 135,667.80
  5. Step 5: Solve for x
    x = 135,667.80/317.16
  6. Step 6: Final answer
    x = 427.76

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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.