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Finding the Fourth Proportional to 28,991, 39,707.80 and 27,288.78

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Solution

The fourth proportional to 28,991, 39,707.80 and 27,288.78 is: 37,376.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,991 : 39,707.80 = 27,288.78 : x
  2. Step 2: Convert to fraction form
    28,991/39,707.80 = 27,288.78/x
  3. Step 3: Cross multiply
    28,991x = 39,707.80 × 27,288.78
  4. Step 4: Simplify right side
    28,991x = 1,083,577,418.48
  5. Step 5: Solve for x
    x = 1,083,577,418.48/28,991
  6. Step 6: Final answer
    x = 37,376.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.