Home / 2,121.16-2,928-1,403.20

Finding the Fourth Proportional to 2,121.16, 2,928 and 1,403.20

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Solution

The fourth proportional to 2,121.16, 2,928 and 1,403.20 is: 1,936.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.16 : 2,928 = 1,403.20 : x
  2. Step 2: Convert to fraction form
    2,121.16/2,928 = 1,403.20/x
  3. Step 3: Cross multiply
    2,121.16x = 2,928 × 1,403.20
  4. Step 4: Simplify right side
    2,121.16x = 4,108,569.60
  5. Step 5: Solve for x
    x = 4,108,569.60/2,121.16
  6. Step 6: Final answer
    x = 1,936.94

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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.