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Finding the Fourth Proportional to 320.08, 479.30 and 278.76

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Solution

The fourth proportional to 320.08, 479.30 and 278.76 is: 417.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.08 : 479.30 = 278.76 : x
  2. Step 2: Convert to fraction form
    320.08/479.30 = 278.76/x
  3. Step 3: Cross multiply
    320.08x = 479.30 × 278.76
  4. Step 4: Simplify right side
    320.08x = 133,609.67
  5. Step 5: Solve for x
    x = 133,609.67/320.08
  6. Step 6: Final answer
    x = 417.43

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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.