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Finding the Fourth Proportional to 347.40, 478.80 and 272.64

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Solution

The fourth proportional to 347.40, 478.80 and 272.64 is: 375.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.40 : 478.80 = 272.64 : x
  2. Step 2: Convert to fraction form
    347.40/478.80 = 272.64/x
  3. Step 3: Cross multiply
    347.40x = 478.80 × 272.64
  4. Step 4: Simplify right side
    347.40x = 130,540.03
  5. Step 5: Solve for x
    x = 130,540.03/347.40
  6. Step 6: Final answer
    x = 375.76

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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.