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Finding the Fourth Proportional to 645.50, 890.75 and 350.76

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Solution

The fourth proportional to 645.50, 890.75 and 350.76 is: 484.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.50 : 890.75 = 350.76 : x
  2. Step 2: Convert to fraction form
    645.50/890.75 = 350.76/x
  3. Step 3: Cross multiply
    645.50x = 890.75 × 350.76
  4. Step 4: Simplify right side
    645.50x = 312,443.19
  5. Step 5: Solve for x
    x = 312,443.19/645.50
  6. Step 6: Final answer
    x = 484.03

Related Problems

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