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Finding the Fourth Proportional to 316.98, 439.29 and 307.67

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Solution

The fourth proportional to 316.98, 439.29 and 307.67 is: 426.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.98 : 439.29 = 307.67 : x
  2. Step 2: Convert to fraction form
    316.98/439.29 = 307.67/x
  3. Step 3: Cross multiply
    316.98x = 439.29 × 307.67
  4. Step 4: Simplify right side
    316.98x = 135,154.16
  5. Step 5: Solve for x
    x = 135,154.16/316.98
  6. Step 6: Final answer
    x = 426.38

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.