Home / 1,389.14-1,917.77-1,105.00

Finding the Fourth Proportional to 1,389.14, 1,917.77 and 1,105.00

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Solution

The fourth proportional to 1,389.14, 1,917.77 and 1,105.00 is: 1,525.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.14 : 1,917.77 = 1,105.00 : x
  2. Step 2: Convert to fraction form
    1,389.14/1,917.77 = 1,105.00/x
  3. Step 3: Cross multiply
    1,389.14x = 1,917.77 × 1,105.00
  4. Step 4: Simplify right side
    1,389.14x = 2,119,125.53
  5. Step 5: Solve for x
    x = 2,119,125.53/1,389.14
  6. Step 6: Final answer
    x = 1,525.50

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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.