Home / 1,245.51-1,865.79-1,143.45

Finding the Fourth Proportional to 1,245.51, 1,865.79 and 1,143.45

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Solution

The fourth proportional to 1,245.51, 1,865.79 and 1,143.45 is: 1,712.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.51 : 1,865.79 = 1,143.45 : x
  2. Step 2: Convert to fraction form
    1,245.51/1,865.79 = 1,143.45/x
  3. Step 3: Cross multiply
    1,245.51x = 1,865.79 × 1,143.45
  4. Step 4: Simplify right side
    1,245.51x = 2,133,437.58
  5. Step 5: Solve for x
    x = 2,133,437.58/1,245.51
  6. Step 6: Final answer
    x = 1,712.90

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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.