Home / 1,131.76-1,698.36-1,122.50

Finding the Fourth Proportional to 1,131.76, 1,698.36 and 1,122.50

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Solution

The fourth proportional to 1,131.76, 1,698.36 and 1,122.50 is: 1,684.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.76 : 1,698.36 = 1,122.50 : x
  2. Step 2: Convert to fraction form
    1,131.76/1,698.36 = 1,122.50/x
  3. Step 3: Cross multiply
    1,131.76x = 1,698.36 × 1,122.50
  4. Step 4: Simplify right side
    1,131.76x = 1,906,409.10
  5. Step 5: Solve for x
    x = 1,906,409.10/1,131.76
  6. Step 6: Final answer
    x = 1,684.46

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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.