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Finding the Fourth Proportional to 20,959.63, 28,924.71 and 11,528.21

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Solution

The fourth proportional to 20,959.63, 28,924.71 and 11,528.21 is: 15,909.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.63 : 28,924.71 = 11,528.21 : x
  2. Step 2: Convert to fraction form
    20,959.63/28,924.71 = 11,528.21/x
  3. Step 3: Cross multiply
    20,959.63x = 28,924.71 × 11,528.21
  4. Step 4: Simplify right side
    20,959.63x = 333,450,131.07
  5. Step 5: Solve for x
    x = 333,450,131.07/20,959.63
  6. Step 6: Final answer
    x = 15,909.16

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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.