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Finding the Fourth Proportional to 449.27, 619.80 and 309.57

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Solution

The fourth proportional to 449.27, 619.80 and 309.57 is: 427.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.27 : 619.80 = 309.57 : x
  2. Step 2: Convert to fraction form
    449.27/619.80 = 309.57/x
  3. Step 3: Cross multiply
    449.27x = 619.80 × 309.57
  4. Step 4: Simplify right side
    449.27x = 191,871.49
  5. Step 5: Solve for x
    x = 191,871.49/449.27
  6. Step 6: Final answer
    x = 427.07

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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.