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Finding the Fourth Proportional to 1,311.89, 1,810.26 and 722.39

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Solution

The fourth proportional to 1,311.89, 1,810.26 and 722.39 is: 996.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.89 : 1,810.26 = 722.39 : x
  2. Step 2: Convert to fraction form
    1,311.89/1,810.26 = 722.39/x
  3. Step 3: Cross multiply
    1,311.89x = 1,810.26 × 722.39
  4. Step 4: Simplify right side
    1,311.89x = 1,307,704.67
  5. Step 5: Solve for x
    x = 1,307,704.67/1,311.89
  6. Step 6: Final answer
    x = 996.81

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.