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Finding the Fourth Proportional to 448.98, 619.34 and 399.08

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Solution

The fourth proportional to 448.98, 619.34 and 399.08 is: 550.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.98 : 619.34 = 399.08 : x
  2. Step 2: Convert to fraction form
    448.98/619.34 = 399.08/x
  3. Step 3: Cross multiply
    448.98x = 619.34 × 399.08
  4. Step 4: Simplify right side
    448.98x = 247,166.21
  5. Step 5: Solve for x
    x = 247,166.21/448.98
  6. Step 6: Final answer
    x = 550.51

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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.