Home / 20,685.51-28,536.89-12,724.83

Finding the Fourth Proportional to 20,685.51, 28,536.89 and 12,724.83

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Solution

The fourth proportional to 20,685.51, 28,536.89 and 12,724.83 is: 17,554.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.51 : 28,536.89 = 12,724.83 : x
  2. Step 2: Convert to fraction form
    20,685.51/28,536.89 = 12,724.83/x
  3. Step 3: Cross multiply
    20,685.51x = 28,536.89 × 12,724.83
  4. Step 4: Simplify right side
    20,685.51x = 363,127,010.35
  5. Step 5: Solve for x
    x = 363,127,010.35/20,685.51
  6. Step 6: Final answer
    x = 17,554.66

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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.