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Finding the Fourth Proportional to 347.26, 478.94 and 305.72

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Solution

The fourth proportional to 347.26, 478.94 and 305.72 is: 421.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.26 : 478.94 = 305.72 : x
  2. Step 2: Convert to fraction form
    347.26/478.94 = 305.72/x
  3. Step 3: Cross multiply
    347.26x = 478.94 × 305.72
  4. Step 4: Simplify right side
    347.26x = 146,420.01
  5. Step 5: Solve for x
    x = 146,420.01/347.26
  6. Step 6: Final answer
    x = 421.65

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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.