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Finding the Fourth Proportional to 20,940.65, 28,897.58 and 11,987.58

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Solution

The fourth proportional to 20,940.65, 28,897.58 and 11,987.58 is: 16,542.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.65 : 28,897.58 = 11,987.58 : x
  2. Step 2: Convert to fraction form
    20,940.65/28,897.58 = 11,987.58/x
  3. Step 3: Cross multiply
    20,940.65x = 28,897.58 × 11,987.58
  4. Step 4: Simplify right side
    20,940.65x = 346,411,992.12
  5. Step 5: Solve for x
    x = 346,411,992.12/20,940.65
  6. Step 6: Final answer
    x = 16,542.57

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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.