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Finding the Fourth Proportional to 645.55, 890.83 and 365.78

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Solution

The fourth proportional to 645.55, 890.83 and 365.78 is: 504.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.55 : 890.83 = 365.78 : x
  2. Step 2: Convert to fraction form
    645.55/890.83 = 365.78/x
  3. Step 3: Cross multiply
    645.55x = 890.83 × 365.78
  4. Step 4: Simplify right side
    645.55x = 325,845.77
  5. Step 5: Solve for x
    x = 325,845.77/645.55
  6. Step 6: Final answer
    x = 504.76

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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.