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Finding the Fourth Proportional to 28,958.40, 39,927.60 and 19,991.70

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Solution

The fourth proportional to 28,958.40, 39,927.60 and 19,991.70 is: 27,564.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,958.40 : 39,927.60 = 19,991.70 : x
  2. Step 2: Convert to fraction form
    28,958.40/39,927.60 = 19,991.70/x
  3. Step 3: Cross multiply
    28,958.40x = 39,927.60 × 19,991.70
  4. Step 4: Simplify right side
    28,958.40x = 798,220,600.92
  5. Step 5: Solve for x
    x = 798,220,600.92/28,958.40
  6. Step 6: Final answer
    x = 27,564.39

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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.