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Finding the Fourth Proportional to 347.44, 478.56 and 321.49

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Solution

The fourth proportional to 347.44, 478.56 and 321.49 is: 442.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.44 : 478.56 = 321.49 : x
  2. Step 2: Convert to fraction form
    347.44/478.56 = 321.49/x
  3. Step 3: Cross multiply
    347.44x = 478.56 × 321.49
  4. Step 4: Simplify right side
    347.44x = 153,852.25
  5. Step 5: Solve for x
    x = 153,852.25/347.44
  6. Step 6: Final answer
    x = 442.82

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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.