Home / 812,085.70-1,218,205.35-221,109.70

Finding the Fourth Proportional to 812,085.70, 1,218,205.35 and 221,109.70

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Solution

The fourth proportional to 812,085.70, 1,218,205.35 and 221,109.70 is: 331,685.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,085.70 : 1,218,205.35 = 221,109.70 : x
  2. Step 2: Convert to fraction form
    812,085.70/1,218,205.35 = 221,109.70/x
  3. Step 3: Cross multiply
    812,085.70x = 1,218,205.35 × 221,109.70
  4. Step 4: Simplify right side
    812,085.70x = 269,357,019,476.90
  5. Step 5: Solve for x
    x = 269,357,019,476.90/812,085.70
  6. Step 6: Final answer
    x = 331,685.46

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Double scale
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Similar ratio
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1.5x scale

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.