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Finding the Fourth Proportional to 1,021.19, 1,400.76 and 1,012.43

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Solution

The fourth proportional to 1,021.19, 1,400.76 and 1,012.43 is: 1,388.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.19 : 1,400.76 = 1,012.43 : x
  2. Step 2: Convert to fraction form
    1,021.19/1,400.76 = 1,012.43/x
  3. Step 3: Cross multiply
    1,021.19x = 1,400.76 × 1,012.43
  4. Step 4: Simplify right side
    1,021.19x = 1,418,174.95
  5. Step 5: Solve for x
    x = 1,418,174.95/1,021.19
  6. Step 6: Final answer
    x = 1,388.75

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.