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Finding the Fourth Proportional to 645.09, 890.15 and 365.28

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Solution

The fourth proportional to 645.09, 890.15 and 365.28 is: 504.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.09 : 890.15 = 365.28 : x
  2. Step 2: Convert to fraction form
    645.09/890.15 = 365.28/x
  3. Step 3: Cross multiply
    645.09x = 890.15 × 365.28
  4. Step 4: Simplify right side
    645.09x = 325,154.91
  5. Step 5: Solve for x
    x = 325,154.91/645.09
  6. Step 6: Final answer
    x = 504.05

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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.