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Finding the Fourth Proportional to 20,991.97, 28,967.60 and 11,560.53

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Solution

The fourth proportional to 20,991.97, 28,967.60 and 11,560.53 is: 15,952.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.97 : 28,967.60 = 11,560.53 : x
  2. Step 2: Convert to fraction form
    20,991.97/28,967.60 = 11,560.53/x
  3. Step 3: Cross multiply
    20,991.97x = 28,967.60 × 11,560.53
  4. Step 4: Simplify right side
    20,991.97x = 334,880,792.51
  5. Step 5: Solve for x
    x = 334,880,792.51/20,991.97
  6. Step 6: Final answer
    x = 15,952.81

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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.