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Finding the Fourth Proportional to 321.99, 483.39 and 253.74

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Solution

The fourth proportional to 321.99, 483.39 and 253.74 is: 380.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.99 : 483.39 = 253.74 : x
  2. Step 2: Convert to fraction form
    321.99/483.39 = 253.74/x
  3. Step 3: Cross multiply
    321.99x = 483.39 × 253.74
  4. Step 4: Simplify right side
    321.99x = 122,655.38
  5. Step 5: Solve for x
    x = 122,655.38/321.99
  6. Step 6: Final answer
    x = 380.93

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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.