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Finding the Fourth Proportional to 320.76, 479.93 and 275.20

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Solution

The fourth proportional to 320.76, 479.93 and 275.20 is: 411.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.76 : 479.93 = 275.20 : x
  2. Step 2: Convert to fraction form
    320.76/479.93 = 275.20/x
  3. Step 3: Cross multiply
    320.76x = 479.93 × 275.20
  4. Step 4: Simplify right side
    320.76x = 132,074.16
  5. Step 5: Solve for x
    x = 132,074.16/320.76
  6. Step 6: Final answer
    x = 411.75

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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.