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Finding the Fourth Proportional to 720.60, 994.86 and 668.67

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Solution

The fourth proportional to 720.60, 994.86 and 668.67 is: 923.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.60 : 994.86 = 668.67 : x
  2. Step 2: Convert to fraction form
    720.60/994.86 = 668.67/x
  3. Step 3: Cross multiply
    720.60x = 994.86 × 668.67
  4. Step 4: Simplify right side
    720.60x = 665,233.04
  5. Step 5: Solve for x
    x = 665,233.04/720.60
  6. Step 6: Final answer
    x = 923.17

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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.