Home / 1,389.34-2,086.26-921.54

Finding the Fourth Proportional to 1,389.34, 2,086.26 and 921.54

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Solution

The fourth proportional to 1,389.34, 2,086.26 and 921.54 is: 1,383.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.34 : 2,086.26 = 921.54 : x
  2. Step 2: Convert to fraction form
    1,389.34/2,086.26 = 921.54/x
  3. Step 3: Cross multiply
    1,389.34x = 2,086.26 × 921.54
  4. Step 4: Simplify right side
    1,389.34x = 1,922,572.04
  5. Step 5: Solve for x
    x = 1,922,572.04/1,389.34
  6. Step 6: Final answer
    x = 1,383.80

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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.