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Finding the Fourth Proportional to 449.24, 618.54 and 390.68

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Solution

The fourth proportional to 449.24, 618.54 and 390.68 is: 537.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.24 : 618.54 = 390.68 : x
  2. Step 2: Convert to fraction form
    449.24/618.54 = 390.68/x
  3. Step 3: Cross multiply
    449.24x = 618.54 × 390.68
  4. Step 4: Simplify right side
    449.24x = 241,651.21
  5. Step 5: Solve for x
    x = 241,651.21/449.24
  6. Step 6: Final answer
    x = 537.91

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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.