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Finding the Fourth Proportional to 679.08, 936.48 and 445.80

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Solution

The fourth proportional to 679.08, 936.48 and 445.80 is: 614.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.08 : 936.48 = 445.80 : x
  2. Step 2: Convert to fraction form
    679.08/936.48 = 445.80/x
  3. Step 3: Cross multiply
    679.08x = 936.48 × 445.80
  4. Step 4: Simplify right side
    679.08x = 417,482.78
  5. Step 5: Solve for x
    x = 417,482.78/679.08
  6. Step 6: Final answer
    x = 614.78

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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.