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Finding the Fourth Proportional to 347.08, 478.92 and 308.20

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Solution

The fourth proportional to 347.08, 478.92 and 308.20 is: 425.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.08 : 478.92 = 308.20 : x
  2. Step 2: Convert to fraction form
    347.08/478.92 = 308.20/x
  3. Step 3: Cross multiply
    347.08x = 478.92 × 308.20
  4. Step 4: Simplify right side
    347.08x = 147,603.14
  5. Step 5: Solve for x
    x = 147,603.14/347.08
  6. Step 6: Final answer
    x = 425.27

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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.