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Finding the Fourth Proportional to 20,685.59, 28,539.14 and 12,724.91

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Solution

The fourth proportional to 20,685.59, 28,539.14 and 12,724.91 is: 17,556.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.59 : 28,539.14 = 12,724.91 : x
  2. Step 2: Convert to fraction form
    20,685.59/28,539.14 = 12,724.91/x
  3. Step 3: Cross multiply
    20,685.59x = 28,539.14 × 12,724.91
  4. Step 4: Simplify right side
    20,685.59x = 363,157,781.66
  5. Step 5: Solve for x
    x = 363,157,781.66/20,685.59
  6. Step 6: Final answer
    x = 17,556.08

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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.