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Finding the Fourth Proportional to 28,857.70, 43,286.55 and 13,305.70

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Solution

The fourth proportional to 28,857.70, 43,286.55 and 13,305.70 is: 19,958.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,857.70 : 43,286.55 = 13,305.70 : x
  2. Step 2: Convert to fraction form
    28,857.70/43,286.55 = 13,305.70/x
  3. Step 3: Cross multiply
    28,857.70x = 43,286.55 × 13,305.70
  4. Step 4: Simplify right side
    28,857.70x = 575,957,848.34
  5. Step 5: Solve for x
    x = 575,957,848.34/28,857.70
  6. Step 6: Final answer
    x = 19,958.55

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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.