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Finding the Fourth Proportional to 448.85, 619.68 and 309.21

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Solution

The fourth proportional to 448.85, 619.68 and 309.21 is: 426.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.85 : 619.68 = 309.21 : x
  2. Step 2: Convert to fraction form
    448.85/619.68 = 309.21/x
  3. Step 3: Cross multiply
    448.85x = 619.68 × 309.21
  4. Step 4: Simplify right side
    448.85x = 191,611.25
  5. Step 5: Solve for x
    x = 191,611.25/448.85
  6. Step 6: Final answer
    x = 426.90

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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.