Home / 1,118.40-1,680-1,072.32

Finding the Fourth Proportional to 1,118.40, 1,680 and 1,072.32

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Solution

The fourth proportional to 1,118.40, 1,680 and 1,072.32 is: 1,610.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.40 : 1,680 = 1,072.32 : x
  2. Step 2: Convert to fraction form
    1,118.40/1,680 = 1,072.32/x
  3. Step 3: Cross multiply
    1,118.40x = 1,680 × 1,072.32
  4. Step 4: Simplify right side
    1,118.40x = 1,801,497.60
  5. Step 5: Solve for x
    x = 1,801,497.60/1,118.40
  6. Step 6: Final answer
    x = 1,610.78

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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.