Home / 21,855.27-30,159.39-12,905.65

Finding the Fourth Proportional to 21,855.27, 30,159.39 and 12,905.65

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Solution

The fourth proportional to 21,855.27, 30,159.39 and 12,905.65 is: 17,809.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,855.27 : 30,159.39 = 12,905.65 : x
  2. Step 2: Convert to fraction form
    21,855.27/30,159.39 = 12,905.65/x
  3. Step 3: Cross multiply
    21,855.27x = 30,159.39 × 12,905.65
  4. Step 4: Simplify right side
    21,855.27x = 389,226,467.03
  5. Step 5: Solve for x
    x = 389,226,467.03/21,855.27
  6. Step 6: Final answer
    x = 17,809.28

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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.