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Finding the Fourth Proportional to 1,311.73, 1,810.20 and 722.28

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Solution

The fourth proportional to 1,311.73, 1,810.20 and 722.28 is: 996.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.73 : 1,810.20 = 722.28 : x
  2. Step 2: Convert to fraction form
    1,311.73/1,810.20 = 722.28/x
  3. Step 3: Cross multiply
    1,311.73x = 1,810.20 × 722.28
  4. Step 4: Simplify right side
    1,311.73x = 1,307,471.26
  5. Step 5: Solve for x
    x = 1,307,471.26/1,311.73
  6. Step 6: Final answer
    x = 996.75

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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.