Home / 19,678.20-27,190.50-15,731.88

Finding the Fourth Proportional to 19,678.20, 27,190.50 and 15,731.88

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Solution

The fourth proportional to 19,678.20, 27,190.50 and 15,731.88 is: 21,737.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,678.20 : 27,190.50 = 15,731.88 : x
  2. Step 2: Convert to fraction form
    19,678.20/27,190.50 = 15,731.88/x
  3. Step 3: Cross multiply
    19,678.20x = 27,190.50 × 15,731.88
  4. Step 4: Simplify right side
    19,678.20x = 427,757,683.14
  5. Step 5: Solve for x
    x = 427,757,683.14/19,678.20
  6. Step 6: Final answer
    x = 21,737.64

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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.