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Finding the Fourth Proportional to 21,779.40, 30,054.74 and 11,843.40

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Solution

The fourth proportional to 21,779.40, 30,054.74 and 11,843.40 is: 16,343.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,779.40 : 30,054.74 = 11,843.40 : x
  2. Step 2: Convert to fraction form
    21,779.40/30,054.74 = 11,843.40/x
  3. Step 3: Cross multiply
    21,779.40x = 30,054.74 × 11,843.40
  4. Step 4: Simplify right side
    21,779.40x = 355,950,307.72
  5. Step 5: Solve for x
    x = 355,950,307.72/21,779.40
  6. Step 6: Final answer
    x = 16,343.44

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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.