Home / 20,810.51-28,719-12,634.20

Finding the Fourth Proportional to 20,810.51, 28,719 and 12,634.20

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Solution

The fourth proportional to 20,810.51, 28,719 and 12,634.20 is: 17,435.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.51 : 28,719 = 12,634.20 : x
  2. Step 2: Convert to fraction form
    20,810.51/28,719 = 12,634.20/x
  3. Step 3: Cross multiply
    20,810.51x = 28,719 × 12,634.20
  4. Step 4: Simplify right side
    20,810.51x = 362,841,589.80
  5. Step 5: Solve for x
    x = 362,841,589.80/20,810.51
  6. Step 6: Final answer
    x = 17,435.50

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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.