Home / 1,115.19-1,538.45-722.34

Finding the Fourth Proportional to 1,115.19, 1,538.45 and 722.34

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Solution

The fourth proportional to 1,115.19, 1,538.45 and 722.34 is: 996.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.19 : 1,538.45 = 722.34 : x
  2. Step 2: Convert to fraction form
    1,115.19/1,538.45 = 722.34/x
  3. Step 3: Cross multiply
    1,115.19x = 1,538.45 × 722.34
  4. Step 4: Simplify right side
    1,115.19x = 1,111,272.67
  5. Step 5: Solve for x
    x = 1,111,272.67/1,115.19
  6. Step 6: Final answer
    x = 996.49

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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.