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Finding the Fourth Proportional to 449.52, 619.77 and 309.69

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Solution

The fourth proportional to 449.52, 619.77 and 309.69 is: 426.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.52 : 619.77 = 309.69 : x
  2. Step 2: Convert to fraction form
    449.52/619.77 = 309.69/x
  3. Step 3: Cross multiply
    449.52x = 619.77 × 309.69
  4. Step 4: Simplify right side
    449.52x = 191,936.57
  5. Step 5: Solve for x
    x = 191,936.57/449.52
  6. Step 6: Final answer
    x = 426.98

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.