Home / 1,317.47-1,974.38-1,121.45

Finding the Fourth Proportional to 1,317.47, 1,974.38 and 1,121.45

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Solution

The fourth proportional to 1,317.47, 1,974.38 and 1,121.45 is: 1,680.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.47 : 1,974.38 = 1,121.45 : x
  2. Step 2: Convert to fraction form
    1,317.47/1,974.38 = 1,121.45/x
  3. Step 3: Cross multiply
    1,317.47x = 1,974.38 × 1,121.45
  4. Step 4: Simplify right side
    1,317.47x = 2,214,152.97
  5. Step 5: Solve for x
    x = 2,214,152.97/1,317.47
  6. Step 6: Final answer
    x = 1,680.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.