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Finding the Fourth Proportional to 321.48, 442.31 and 283.97

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Solution

The fourth proportional to 321.48, 442.31 and 283.97 is: 390.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.48 : 442.31 = 283.97 : x
  2. Step 2: Convert to fraction form
    321.48/442.31 = 283.97/x
  3. Step 3: Cross multiply
    321.48x = 442.31 × 283.97
  4. Step 4: Simplify right side
    321.48x = 125,602.46
  5. Step 5: Solve for x
    x = 125,602.46/321.48
  6. Step 6: Final answer
    x = 390.70

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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.