Home / 1,389.40-1,917.62-1,057.32

Finding the Fourth Proportional to 1,389.40, 1,917.62 and 1,057.32

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Solution

The fourth proportional to 1,389.40, 1,917.62 and 1,057.32 is: 1,459.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.40 : 1,917.62 = 1,057.32 : x
  2. Step 2: Convert to fraction form
    1,389.40/1,917.62 = 1,057.32/x
  3. Step 3: Cross multiply
    1,389.40x = 1,917.62 × 1,057.32
  4. Step 4: Simplify right side
    1,389.40x = 2,027,537.98
  5. Step 5: Solve for x
    x = 2,027,537.98/1,389.40
  6. Step 6: Final answer
    x = 1,459.29

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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.