Home / 21,006.88-28,971.84-12,621.76

Finding the Fourth Proportional to 21,006.88, 28,971.84 and 12,621.76

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Solution

The fourth proportional to 21,006.88, 28,971.84 and 12,621.76 is: 17,407.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.88 : 28,971.84 = 12,621.76 : x
  2. Step 2: Convert to fraction form
    21,006.88/28,971.84 = 12,621.76/x
  3. Step 3: Cross multiply
    21,006.88x = 28,971.84 × 12,621.76
  4. Step 4: Simplify right side
    21,006.88x = 365,675,611.24
  5. Step 5: Solve for x
    x = 365,675,611.24/21,006.88
  6. Step 6: Final answer
    x = 17,407.42

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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.