Home / 1,389.85-1,914.09-1,359.61

Finding the Fourth Proportional to 1,389.85, 1,914.09 and 1,359.61

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Solution

The fourth proportional to 1,389.85, 1,914.09 and 1,359.61 is: 1,872.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.85 : 1,914.09 = 1,359.61 : x
  2. Step 2: Convert to fraction form
    1,389.85/1,914.09 = 1,359.61/x
  3. Step 3: Cross multiply
    1,389.85x = 1,914.09 × 1,359.61
  4. Step 4: Simplify right side
    1,389.85x = 2,602,415.90
  5. Step 5: Solve for x
    x = 2,602,415.90/1,389.85
  6. Step 6: Final answer
    x = 1,872.44

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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.