Home / 21,080.49-29,091.63-11,520.78

Finding the Fourth Proportional to 21,080.49, 29,091.63 and 11,520.78

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Solution

The fourth proportional to 21,080.49, 29,091.63 and 11,520.78 is: 15,898.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,080.49 : 29,091.63 = 11,520.78 : x
  2. Step 2: Convert to fraction form
    21,080.49/29,091.63 = 11,520.78/x
  3. Step 3: Cross multiply
    21,080.49x = 29,091.63 × 11,520.78
  4. Step 4: Simplify right side
    21,080.49x = 335,158,269.07
  5. Step 5: Solve for x
    x = 335,158,269.07/21,080.49
  6. Step 6: Final answer
    x = 15,898.98

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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.