Home / 1,321.60-1,826.40-1,085.17

Finding the Fourth Proportional to 1,321.60, 1,826.40 and 1,085.17

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Solution

The fourth proportional to 1,321.60, 1,826.40 and 1,085.17 is: 1,499.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.60 : 1,826.40 = 1,085.17 : x
  2. Step 2: Convert to fraction form
    1,321.60/1,826.40 = 1,085.17/x
  3. Step 3: Cross multiply
    1,321.60x = 1,826.40 × 1,085.17
  4. Step 4: Simplify right side
    1,321.60x = 1,981,954.49
  5. Step 5: Solve for x
    x = 1,981,954.49/1,321.60
  6. Step 6: Final answer
    x = 1,499.66

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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.