Home / 1,104.85-1,521.21-938.80

Finding the Fourth Proportional to 1,104.85, 1,521.21 and 938.80

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Solution

The fourth proportional to 1,104.85, 1,521.21 and 938.80 is: 1,292.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,104.85 : 1,521.21 = 938.80 : x
  2. Step 2: Convert to fraction form
    1,104.85/1,521.21 = 938.80/x
  3. Step 3: Cross multiply
    1,104.85x = 1,521.21 × 938.80
  4. Step 4: Simplify right side
    1,104.85x = 1,428,111.95
  5. Step 5: Solve for x
    x = 1,428,111.95/1,104.85
  6. Step 6: Final answer
    x = 1,292.58

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1.5x scale

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.