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Finding the Fourth Proportional to 321.93, 479.43 and 307.89

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Solution

The fourth proportional to 321.93, 479.43 and 307.89 is: 458.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.93 : 479.43 = 307.89 : x
  2. Step 2: Convert to fraction form
    321.93/479.43 = 307.89/x
  3. Step 3: Cross multiply
    321.93x = 479.43 × 307.89
  4. Step 4: Simplify right side
    321.93x = 147,611.70
  5. Step 5: Solve for x
    x = 147,611.70/321.93
  6. Step 6: Final answer
    x = 458.52

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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.