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Finding the Fourth Proportional to 653.40, 979.20 and 327.96

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Solution

The fourth proportional to 653.40, 979.20 and 327.96 is: 491.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.40 : 979.20 = 327.96 : x
  2. Step 2: Convert to fraction form
    653.40/979.20 = 327.96/x
  3. Step 3: Cross multiply
    653.40x = 979.20 × 327.96
  4. Step 4: Simplify right side
    653.40x = 321,138.43
  5. Step 5: Solve for x
    x = 321,138.43/653.40
  6. Step 6: Final answer
    x = 491.49

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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.