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Finding the Fourth Proportional to 1,012.55, 1,396.64 and 638.94

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Solution

The fourth proportional to 1,012.55, 1,396.64 and 638.94 is: 881.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.55 : 1,396.64 = 638.94 : x
  2. Step 2: Convert to fraction form
    1,012.55/1,396.64 = 638.94/x
  3. Step 3: Cross multiply
    1,012.55x = 1,396.64 × 638.94
  4. Step 4: Simplify right side
    1,012.55x = 892,368.14
  5. Step 5: Solve for x
    x = 892,368.14/1,012.55
  6. Step 6: Final answer
    x = 881.31

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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.