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Finding the Fourth Proportional to 1,012.96, 1,398.23 and 640.56

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Solution

The fourth proportional to 1,012.96, 1,398.23 and 640.56 is: 884.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.96 : 1,398.23 = 640.56 : x
  2. Step 2: Convert to fraction form
    1,012.96/1,398.23 = 640.56/x
  3. Step 3: Cross multiply
    1,012.96x = 1,398.23 × 640.56
  4. Step 4: Simplify right side
    1,012.96x = 895,650.21
  5. Step 5: Solve for x
    x = 895,650.21/1,012.96
  6. Step 6: Final answer
    x = 884.19

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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.