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Finding the Fourth Proportional to 1,311.59, 1,809.99 and 722.12

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Solution

The fourth proportional to 1,311.59, 1,809.99 and 722.12 is: 996.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.59 : 1,809.99 = 722.12 : x
  2. Step 2: Convert to fraction form
    1,311.59/1,809.99 = 722.12/x
  3. Step 3: Cross multiply
    1,311.59x = 1,809.99 × 722.12
  4. Step 4: Simplify right side
    1,311.59x = 1,307,029.98
  5. Step 5: Solve for x
    x = 1,307,029.98/1,311.59
  6. Step 6: Final answer
    x = 996.52

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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.