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Finding the Fourth Proportional to 720.42, 993.48 and 679.44

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Solution

The fourth proportional to 720.42, 993.48 and 679.44 is: 936.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.42 : 993.48 = 679.44 : x
  2. Step 2: Convert to fraction form
    720.42/993.48 = 679.44/x
  3. Step 3: Cross multiply
    720.42x = 993.48 × 679.44
  4. Step 4: Simplify right side
    720.42x = 675,010.05
  5. Step 5: Solve for x
    x = 675,010.05/720.42
  6. Step 6: Final answer
    x = 936.97

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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.