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Finding the Fourth Proportional to 607.86, 838.28 and 397.80

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Solution

The fourth proportional to 607.86, 838.28 and 397.80 is: 548.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.86 : 838.28 = 397.80 : x
  2. Step 2: Convert to fraction form
    607.86/838.28 = 397.80/x
  3. Step 3: Cross multiply
    607.86x = 838.28 × 397.80
  4. Step 4: Simplify right side
    607.86x = 333,467.78
  5. Step 5: Solve for x
    x = 333,467.78/607.86
  6. Step 6: Final answer
    x = 548.59

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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.