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Finding the Fourth Proportional to 449.93, 621.20 and 275.38

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Solution

The fourth proportional to 449.93, 621.20 and 275.38 is: 380.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.93 : 621.20 = 275.38 : x
  2. Step 2: Convert to fraction form
    449.93/621.20 = 275.38/x
  3. Step 3: Cross multiply
    449.93x = 621.20 × 275.38
  4. Step 4: Simplify right side
    449.93x = 171,061.57
  5. Step 5: Solve for x
    x = 171,061.57/449.93
  6. Step 6: Final answer
    x = 380.20

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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.