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Finding the Fourth Proportional to 645.50, 967.78 and 320.19

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Solution

The fourth proportional to 645.50, 967.78 and 320.19 is: 480.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.50 : 967.78 = 320.19 : x
  2. Step 2: Convert to fraction form
    645.50/967.78 = 320.19/x
  3. Step 3: Cross multiply
    645.50x = 967.78 × 320.19
  4. Step 4: Simplify right side
    645.50x = 309,870.25
  5. Step 5: Solve for x
    x = 309,870.25/645.50
  6. Step 6: Final answer
    x = 480.05

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.