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Finding the Fourth Proportional to 19,958.40, 27,532.80 and 12,890.88

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Solution

The fourth proportional to 19,958.40, 27,532.80 and 12,890.88 is: 17,783.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,958.40 : 27,532.80 = 12,890.88 : x
  2. Step 2: Convert to fraction form
    19,958.40/27,532.80 = 12,890.88/x
  3. Step 3: Cross multiply
    19,958.40x = 27,532.80 × 12,890.88
  4. Step 4: Simplify right side
    19,958.40x = 354,922,020.86
  5. Step 5: Solve for x
    x = 354,922,020.86/19,958.40
  6. Step 6: Final answer
    x = 17,783.09

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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.