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Finding the Fourth Proportional to 548.95, 822.70 and 420.07

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Solution

The fourth proportional to 548.95, 822.70 and 420.07 is: 629.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.95 : 822.70 = 420.07 : x
  2. Step 2: Convert to fraction form
    548.95/822.70 = 420.07/x
  3. Step 3: Cross multiply
    548.95x = 822.70 × 420.07
  4. Step 4: Simplify right side
    548.95x = 345,591.59
  5. Step 5: Solve for x
    x = 345,591.59/548.95
  6. Step 6: Final answer
    x = 629.55

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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.