Home / 1,409.28-2,113.79-921.26

Finding the Fourth Proportional to 1,409.28, 2,113.79 and 921.26

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Solution

The fourth proportional to 1,409.28, 2,113.79 and 921.26 is: 1,381.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.28 : 2,113.79 = 921.26 : x
  2. Step 2: Convert to fraction form
    1,409.28/2,113.79 = 921.26/x
  3. Step 3: Cross multiply
    1,409.28x = 2,113.79 × 921.26
  4. Step 4: Simplify right side
    1,409.28x = 1,947,335.00
  5. Step 5: Solve for x
    x = 1,947,335.00/1,409.28
  6. Step 6: Final answer
    x = 1,381.79

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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.