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Finding the Fourth Proportional to 449.65, 620.47 and 272.81

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Solution

The fourth proportional to 449.65, 620.47 and 272.81 is: 376.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.65 : 620.47 = 272.81 : x
  2. Step 2: Convert to fraction form
    449.65/620.47 = 272.81/x
  3. Step 3: Cross multiply
    449.65x = 620.47 × 272.81
  4. Step 4: Simplify right side
    449.65x = 169,270.42
  5. Step 5: Solve for x
    x = 169,270.42/449.65
  6. Step 6: Final answer
    x = 376.45

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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.