Home / 21,311.80-29,422.89-18,947.40

Finding the Fourth Proportional to 21,311.80, 29,422.89 and 18,947.40

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Solution

The fourth proportional to 21,311.80, 29,422.89 and 18,947.40 is: 26,158.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,311.80 : 29,422.89 = 18,947.40 : x
  2. Step 2: Convert to fraction form
    21,311.80/29,422.89 = 18,947.40/x
  3. Step 3: Cross multiply
    21,311.80x = 29,422.89 × 18,947.40
  4. Step 4: Simplify right side
    21,311.80x = 557,487,265.99
  5. Step 5: Solve for x
    x = 557,487,265.99/21,311.80
  6. Step 6: Final answer
    x = 26,158.62

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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.