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Finding the Fourth Proportional to 21,891.53, 30,199.50 and 12,934.71

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Solution

The fourth proportional to 21,891.53, 30,199.50 and 12,934.71 is: 17,843.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.53 : 30,199.50 = 12,934.71 : x
  2. Step 2: Convert to fraction form
    21,891.53/30,199.50 = 12,934.71/x
  3. Step 3: Cross multiply
    21,891.53x = 30,199.50 × 12,934.71
  4. Step 4: Simplify right side
    21,891.53x = 390,621,774.65
  5. Step 5: Solve for x
    x = 390,621,774.65/21,891.53
  6. Step 6: Final answer
    x = 17,843.51

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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.