Home / 21,381.87-29,515.22-19,139.79

Finding the Fourth Proportional to 21,381.87, 29,515.22 and 19,139.79

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Solution

The fourth proportional to 21,381.87, 29,515.22 and 19,139.79 is: 26,420.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,381.87 : 29,515.22 = 19,139.79 : x
  2. Step 2: Convert to fraction form
    21,381.87/29,515.22 = 19,139.79/x
  3. Step 3: Cross multiply
    21,381.87x = 29,515.22 × 19,139.79
  4. Step 4: Simplify right side
    21,381.87x = 564,915,112.60
  5. Step 5: Solve for x
    x = 564,915,112.60/21,381.87
  6. Step 6: Final answer
    x = 26,420.29

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1.5x scale

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.