Home / 1,400.91-1,931.99-1,121.18

Finding the Fourth Proportional to 1,400.91, 1,931.99 and 1,121.18

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Solution

The fourth proportional to 1,400.91, 1,931.99 and 1,121.18 is: 1,546.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.91 : 1,931.99 = 1,121.18 : x
  2. Step 2: Convert to fraction form
    1,400.91/1,931.99 = 1,121.18/x
  3. Step 3: Cross multiply
    1,400.91x = 1,931.99 × 1,121.18
  4. Step 4: Simplify right side
    1,400.91x = 2,166,093.28
  5. Step 5: Solve for x
    x = 2,166,093.28/1,400.91
  6. Step 6: Final answer
    x = 1,546.20

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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.