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Finding the Fourth Proportional to 21,934.98, 30,268.41 and 12,980.91

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Solution

The fourth proportional to 21,934.98, 30,268.41 and 12,980.91 is: 17,912.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,934.98 : 30,268.41 = 12,980.91 : x
  2. Step 2: Convert to fraction form
    21,934.98/30,268.41 = 12,980.91/x
  3. Step 3: Cross multiply
    21,934.98x = 30,268.41 × 12,980.91
  4. Step 4: Simplify right side
    21,934.98x = 392,911,506.05
  5. Step 5: Solve for x
    x = 392,911,506.05/21,934.98
  6. Step 6: Final answer
    x = 17,912.55

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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.