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Finding the Fourth Proportional to 321.95, 444.47 and 290.76

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Solution

The fourth proportional to 321.95, 444.47 and 290.76 is: 401.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.95 : 444.47 = 290.76 : x
  2. Step 2: Convert to fraction form
    321.95/444.47 = 290.76/x
  3. Step 3: Cross multiply
    321.95x = 444.47 × 290.76
  4. Step 4: Simplify right side
    321.95x = 129,232.64
  5. Step 5: Solve for x
    x = 129,232.64/321.95
  6. Step 6: Final answer
    x = 401.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.