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Finding the Fourth Proportional to 720.51, 994.29 and 421.95

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Solution

The fourth proportional to 720.51, 994.29 and 421.95 is: 582.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.51 : 994.29 = 421.95 : x
  2. Step 2: Convert to fraction form
    720.51/994.29 = 421.95/x
  3. Step 3: Cross multiply
    720.51x = 994.29 × 421.95
  4. Step 4: Simplify right side
    720.51x = 419,540.67
  5. Step 5: Solve for x
    x = 419,540.67/720.51
  6. Step 6: Final answer
    x = 582.28

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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.