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Finding the Fourth Proportional to 1,231.02, 1,699 and 1,190.52

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Solution

The fourth proportional to 1,231.02, 1,699 and 1,190.52 is: 1,643.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.02 : 1,699 = 1,190.52 : x
  2. Step 2: Convert to fraction form
    1,231.02/1,699 = 1,190.52/x
  3. Step 3: Cross multiply
    1,231.02x = 1,699 × 1,190.52
  4. Step 4: Simplify right side
    1,231.02x = 2,022,693.48
  5. Step 5: Solve for x
    x = 2,022,693.48/1,231.02
  6. Step 6: Final answer
    x = 1,643.10

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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.