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Finding the Fourth Proportional to 645.40, 890.67 and 350.69

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Solution

The fourth proportional to 645.40, 890.67 and 350.69 is: 483.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.40 : 890.67 = 350.69 : x
  2. Step 2: Convert to fraction form
    645.40/890.67 = 350.69/x
  3. Step 3: Cross multiply
    645.40x = 890.67 × 350.69
  4. Step 4: Simplify right side
    645.40x = 312,343.95
  5. Step 5: Solve for x
    x = 312,343.95/645.40
  6. Step 6: Final answer
    x = 483.96

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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.