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Finding the Fourth Proportional to 485.45, 727.42 and 345.98

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Solution

The fourth proportional to 485.45, 727.42 and 345.98 is: 518.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.45 : 727.42 = 345.98 : x
  2. Step 2: Convert to fraction form
    485.45/727.42 = 345.98/x
  3. Step 3: Cross multiply
    485.45x = 727.42 × 345.98
  4. Step 4: Simplify right side
    485.45x = 251,669.70
  5. Step 5: Solve for x
    x = 251,669.70/485.45
  6. Step 6: Final answer
    x = 518.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.