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Finding the Fourth Proportional to 645.11, 890.25 and 350.38

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Solution

The fourth proportional to 645.11, 890.25 and 350.38 is: 483.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.11 : 890.25 = 350.38 : x
  2. Step 2: Convert to fraction form
    645.11/890.25 = 350.38/x
  3. Step 3: Cross multiply
    645.11x = 890.25 × 350.38
  4. Step 4: Simplify right side
    645.11x = 311,928.22
  5. Step 5: Solve for x
    x = 311,928.22/645.11
  6. Step 6: Final answer
    x = 483.53

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Double scale
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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.