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Finding the Fourth Proportional to 653.12, 979.68 and 328.41

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Solution

The fourth proportional to 653.12, 979.68 and 328.41 is: 492.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.12 : 979.68 = 328.41 : x
  2. Step 2: Convert to fraction form
    653.12/979.68 = 328.41/x
  3. Step 3: Cross multiply
    653.12x = 979.68 × 328.41
  4. Step 4: Simplify right side
    653.12x = 321,736.71
  5. Step 5: Solve for x
    x = 321,736.71/653.12
  6. Step 6: Final answer
    x = 492.61

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Double scale
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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.