Home / 1,239.12-1,709.81-741.66

Finding the Fourth Proportional to 1,239.12, 1,709.81 and 741.66

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Solution

The fourth proportional to 1,239.12, 1,709.81 and 741.66 is: 1,023.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.12 : 1,709.81 = 741.66 : x
  2. Step 2: Convert to fraction form
    1,239.12/1,709.81 = 741.66/x
  3. Step 3: Cross multiply
    1,239.12x = 1,709.81 × 741.66
  4. Step 4: Simplify right side
    1,239.12x = 1,268,090.35
  5. Step 5: Solve for x
    x = 1,268,090.35/1,239.12
  6. Step 6: Final answer
    x = 1,023.38

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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.