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Finding the Fourth Proportional to 18,957.69, 26,131.86 and 12,978.99

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Solution

The fourth proportional to 18,957.69, 26,131.86 and 12,978.99 is: 17,890.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,957.69 : 26,131.86 = 12,978.99 : x
  2. Step 2: Convert to fraction form
    18,957.69/26,131.86 = 12,978.99/x
  3. Step 3: Cross multiply
    18,957.69x = 26,131.86 × 12,978.99
  4. Step 4: Simplify right side
    18,957.69x = 339,165,149.62
  5. Step 5: Solve for x
    x = 339,165,149.62/18,957.69
  6. Step 6: Final answer
    x = 17,890.64

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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.