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Finding the Fourth Proportional to 28,106.71, 38,786.07 and 15,359.59

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Solution

The fourth proportional to 28,106.71, 38,786.07 and 15,359.59 is: 21,195.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,106.71 : 38,786.07 = 15,359.59 : x
  2. Step 2: Convert to fraction form
    28,106.71/38,786.07 = 15,359.59/x
  3. Step 3: Cross multiply
    28,106.71x = 38,786.07 × 15,359.59
  4. Step 4: Simplify right side
    28,106.71x = 595,738,132.91
  5. Step 5: Solve for x
    x = 595,738,132.91/28,106.71
  6. Step 6: Final answer
    x = 21,195.58

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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.