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Finding the Fourth Proportional to 347.72, 479.28 and 319.48

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Solution

The fourth proportional to 347.72, 479.28 and 319.48 is: 440.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.72 : 479.28 = 319.48 : x
  2. Step 2: Convert to fraction form
    347.72/479.28 = 319.48/x
  3. Step 3: Cross multiply
    347.72x = 479.28 × 319.48
  4. Step 4: Simplify right side
    347.72x = 153,120.37
  5. Step 5: Solve for x
    x = 153,120.37/347.72
  6. Step 6: Final answer
    x = 440.36

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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.