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Finding the Fourth Proportional to 21,783.36, 32,668.56 and 7,929.12

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Solution

The fourth proportional to 21,783.36, 32,668.56 and 7,929.12 is: 11,891.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,783.36 : 32,668.56 = 7,929.12 : x
  2. Step 2: Convert to fraction form
    21,783.36/32,668.56 = 7,929.12/x
  3. Step 3: Cross multiply
    21,783.36x = 32,668.56 × 7,929.12
  4. Step 4: Simplify right side
    21,783.36x = 259,032,932.47
  5. Step 5: Solve for x
    x = 259,032,932.47/21,783.36
  6. Step 6: Final answer
    x = 11,891.32

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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.