Home / 21,239.60-31,815.65-12,453.32

Finding the Fourth Proportional to 21,239.60, 31,815.65 and 12,453.32

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Solution

The fourth proportional to 21,239.60, 31,815.65 and 12,453.32 is: 18,654.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.60 : 31,815.65 = 12,453.32 : x
  2. Step 2: Convert to fraction form
    21,239.60/31,815.65 = 12,453.32/x
  3. Step 3: Cross multiply
    21,239.60x = 31,815.65 × 12,453.32
  4. Step 4: Simplify right side
    21,239.60x = 396,210,487.73
  5. Step 5: Solve for x
    x = 396,210,487.73/21,239.60
  6. Step 6: Final answer
    x = 18,654.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.