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Finding the Fourth Proportional to 1,231.31, 1,699.21 and 839.02

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Solution

The fourth proportional to 1,231.31, 1,699.21 and 839.02 is: 1,157.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.31 : 1,699.21 = 839.02 : x
  2. Step 2: Convert to fraction form
    1,231.31/1,699.21 = 839.02/x
  3. Step 3: Cross multiply
    1,231.31x = 1,699.21 × 839.02
  4. Step 4: Simplify right side
    1,231.31x = 1,425,671.16
  5. Step 5: Solve for x
    x = 1,425,671.16/1,231.31
  6. Step 6: Final answer
    x = 1,157.85

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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.