Home / 1,389.36-1,920.04-1,140.28

Finding the Fourth Proportional to 1,389.36, 1,920.04 and 1,140.28

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Solution

The fourth proportional to 1,389.36, 1,920.04 and 1,140.28 is: 1,575.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.36 : 1,920.04 = 1,140.28 : x
  2. Step 2: Convert to fraction form
    1,389.36/1,920.04 = 1,140.28/x
  3. Step 3: Cross multiply
    1,389.36x = 1,920.04 × 1,140.28
  4. Step 4: Simplify right side
    1,389.36x = 2,189,383.21
  5. Step 5: Solve for x
    x = 2,189,383.21/1,389.36
  6. Step 6: Final answer
    x = 1,575.82

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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.