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Finding the Fourth Proportional to 1,281.48, 1,768.53 and 722.01

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Solution

The fourth proportional to 1,281.48, 1,768.53 and 722.01 is: 996.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.48 : 1,768.53 = 722.01 : x
  2. Step 2: Convert to fraction form
    1,281.48/1,768.53 = 722.01/x
  3. Step 3: Cross multiply
    1,281.48x = 1,768.53 × 722.01
  4. Step 4: Simplify right side
    1,281.48x = 1,276,896.35
  5. Step 5: Solve for x
    x = 1,276,896.35/1,281.48
  6. Step 6: Final answer
    x = 996.42

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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.