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Finding the Fourth Proportional to 1,012, 1,397.72 and 998.36

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Solution

The fourth proportional to 1,012, 1,397.72 and 998.36 is: 1,378.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012 : 1,397.72 = 998.36 : x
  2. Step 2: Convert to fraction form
    1,012/1,397.72 = 998.36/x
  3. Step 3: Cross multiply
    1,012x = 1,397.72 × 998.36
  4. Step 4: Simplify right side
    1,012x = 1,395,427.74
  5. Step 5: Solve for x
    x = 1,395,427.74/1,012
  6. Step 6: Final answer
    x = 1,378.88

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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.