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Finding the Fourth Proportional to 700.89, 1,051.20 and 213.81

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Solution

The fourth proportional to 700.89, 1,051.20 and 213.81 is: 320.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.89 : 1,051.20 = 213.81 : x
  2. Step 2: Convert to fraction form
    700.89/1,051.20 = 213.81/x
  3. Step 3: Cross multiply
    700.89x = 1,051.20 × 213.81
  4. Step 4: Simplify right side
    700.89x = 224,757.07
  5. Step 5: Solve for x
    x = 224,757.07/700.89
  6. Step 6: Final answer
    x = 320.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.