Home / 1,319.72-1,980.36-1,218.26

Finding the Fourth Proportional to 1,319.72, 1,980.36 and 1,218.26

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Solution

The fourth proportional to 1,319.72, 1,980.36 and 1,218.26 is: 1,828.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.72 : 1,980.36 = 1,218.26 : x
  2. Step 2: Convert to fraction form
    1,319.72/1,980.36 = 1,218.26/x
  3. Step 3: Cross multiply
    1,319.72x = 1,980.36 × 1,218.26
  4. Step 4: Simplify right side
    1,319.72x = 2,412,593.37
  5. Step 5: Solve for x
    x = 2,412,593.37/1,319.72
  6. Step 6: Final answer
    x = 1,828.11

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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.