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Finding the Fourth Proportional to 1,427.45, 1,969.90 and 838

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Solution

The fourth proportional to 1,427.45, 1,969.90 and 838 is: 1,156.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.45 : 1,969.90 = 838 : x
  2. Step 2: Convert to fraction form
    1,427.45/1,969.90 = 838/x
  3. Step 3: Cross multiply
    1,427.45x = 1,969.90 × 838
  4. Step 4: Simplify right side
    1,427.45x = 1,650,776.20
  5. Step 5: Solve for x
    x = 1,650,776.20/1,427.45
  6. Step 6: Final answer
    x = 1,156.45

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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.