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Finding the Fourth Proportional to 20,873.58, 28,815.39 and 12,921

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Solution

The fourth proportional to 20,873.58, 28,815.39 and 12,921 is: 17,837.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,873.58 : 28,815.39 = 12,921 : x
  2. Step 2: Convert to fraction form
    20,873.58/28,815.39 = 12,921/x
  3. Step 3: Cross multiply
    20,873.58x = 28,815.39 × 12,921
  4. Step 4: Simplify right side
    20,873.58x = 372,323,654.19
  5. Step 5: Solve for x
    x = 372,323,654.19/20,873.58
  6. Step 6: Final answer
    x = 17,837.08

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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.