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Finding the Fourth Proportional to 320.67, 480.15 and 266.40

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Solution

The fourth proportional to 320.67, 480.15 and 266.40 is: 398.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.67 : 480.15 = 266.40 : x
  2. Step 2: Convert to fraction form
    320.67/480.15 = 266.40/x
  3. Step 3: Cross multiply
    320.67x = 480.15 × 266.40
  4. Step 4: Simplify right side
    320.67x = 127,911.96
  5. Step 5: Solve for x
    x = 127,911.96/320.67
  6. Step 6: Final answer
    x = 398.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.