Home / 1,321.59-1,821.70-1,005.84

Finding the Fourth Proportional to 1,321.59, 1,821.70 and 1,005.84

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Solution

The fourth proportional to 1,321.59, 1,821.70 and 1,005.84 is: 1,386.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.59 : 1,821.70 = 1,005.84 : x
  2. Step 2: Convert to fraction form
    1,321.59/1,821.70 = 1,005.84/x
  3. Step 3: Cross multiply
    1,321.59x = 1,821.70 × 1,005.84
  4. Step 4: Simplify right side
    1,321.59x = 1,832,338.73
  5. Step 5: Solve for x
    x = 1,832,338.73/1,321.59
  6. Step 6: Final answer
    x = 1,386.47

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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.