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Finding the Fourth Proportional to 679.02, 936.80 and 445.74

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Solution

The fourth proportional to 679.02, 936.80 and 445.74 is: 614.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.02 : 936.80 = 445.74 : x
  2. Step 2: Convert to fraction form
    679.02/936.80 = 445.74/x
  3. Step 3: Cross multiply
    679.02x = 936.80 × 445.74
  4. Step 4: Simplify right side
    679.02x = 417,569.23
  5. Step 5: Solve for x
    x = 417,569.23/679.02
  6. Step 6: Final answer
    x = 614.96

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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.