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Finding the Fourth Proportional to 1,200.89, 1,798.31 and 760.81

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Solution

The fourth proportional to 1,200.89, 1,798.31 and 760.81 is: 1,139.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.89 : 1,798.31 = 760.81 : x
  2. Step 2: Convert to fraction form
    1,200.89/1,798.31 = 760.81/x
  3. Step 3: Cross multiply
    1,200.89x = 1,798.31 × 760.81
  4. Step 4: Simplify right side
    1,200.89x = 1,368,169.64
  5. Step 5: Solve for x
    x = 1,368,169.64/1,200.89
  6. Step 6: Final answer
    x = 1,139.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.