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Finding the Fourth Proportional to 320.76, 478.44 and 286.92

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Solution

The fourth proportional to 320.76, 478.44 and 286.92 is: 427.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.76 : 478.44 = 286.92 : x
  2. Step 2: Convert to fraction form
    320.76/478.44 = 286.92/x
  3. Step 3: Cross multiply
    320.76x = 478.44 × 286.92
  4. Step 4: Simplify right side
    320.76x = 137,274.00
  5. Step 5: Solve for x
    x = 137,274.00/320.76
  6. Step 6: Final answer
    x = 427.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.