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Finding the Fourth Proportional to 321.84, 443.58 and 307.68

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Solution

The fourth proportional to 321.84, 443.58 and 307.68 is: 424.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.84 : 443.58 = 307.68 : x
  2. Step 2: Convert to fraction form
    321.84/443.58 = 307.68/x
  3. Step 3: Cross multiply
    321.84x = 443.58 × 307.68
  4. Step 4: Simplify right side
    321.84x = 136,480.69
  5. Step 5: Solve for x
    x = 136,480.69/321.84
  6. Step 6: Final answer
    x = 424.06

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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.