Home / 28,212.25-38,935.74-15,639.43

Finding the Fourth Proportional to 28,212.25, 38,935.74 and 15,639.43

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Solution

The fourth proportional to 28,212.25, 38,935.74 and 15,639.43 is: 21,583.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,212.25 : 38,935.74 = 15,639.43 : x
  2. Step 2: Convert to fraction form
    28,212.25/38,935.74 = 15,639.43/x
  3. Step 3: Cross multiply
    28,212.25x = 38,935.74 × 15,639.43
  4. Step 4: Simplify right side
    28,212.25x = 608,932,780.23
  5. Step 5: Solve for x
    x = 608,932,780.23/28,212.25
  6. Step 6: Final answer
    x = 21,583.98

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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.