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Finding the Fourth Proportional to 1,012, 1,396.16 and 638.84

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Solution

The fourth proportional to 1,012, 1,396.16 and 638.84 is: 881.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012 : 1,396.16 = 638.84 : x
  2. Step 2: Convert to fraction form
    1,012/1,396.16 = 638.84/x
  3. Step 3: Cross multiply
    1,012x = 1,396.16 × 638.84
  4. Step 4: Simplify right side
    1,012x = 891,922.85
  5. Step 5: Solve for x
    x = 891,922.85/1,012
  6. Step 6: Final answer
    x = 881.35

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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.