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Finding the Fourth Proportional to 653.80, 979.81 and 329.39

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Solution

The fourth proportional to 653.80, 979.81 and 329.39 is: 493.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.80 : 979.81 = 329.39 : x
  2. Step 2: Convert to fraction form
    653.80/979.81 = 329.39/x
  3. Step 3: Cross multiply
    653.80x = 979.81 × 329.39
  4. Step 4: Simplify right side
    653.80x = 322,739.62
  5. Step 5: Solve for x
    x = 322,739.62/653.80
  6. Step 6: Final answer
    x = 493.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.