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Finding the Fourth Proportional to 1,013.85, 1,399.01 and 641.12

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Solution

The fourth proportional to 1,013.85, 1,399.01 and 641.12 is: 884.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.85 : 1,399.01 = 641.12 : x
  2. Step 2: Convert to fraction form
    1,013.85/1,399.01 = 641.12/x
  3. Step 3: Cross multiply
    1,013.85x = 1,399.01 × 641.12
  4. Step 4: Simplify right side
    1,013.85x = 896,923.09
  5. Step 5: Solve for x
    x = 896,923.09/1,013.85
  6. Step 6: Final answer
    x = 884.67

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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.