Home / 20,975.52-28,964.88-15,661.20

Finding the Fourth Proportional to 20,975.52, 28,964.88 and 15,661.20

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Solution

The fourth proportional to 20,975.52, 28,964.88 and 15,661.20 is: 21,626.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.52 : 28,964.88 = 15,661.20 : x
  2. Step 2: Convert to fraction form
    20,975.52/28,964.88 = 15,661.20/x
  3. Step 3: Cross multiply
    20,975.52x = 28,964.88 × 15,661.20
  4. Step 4: Simplify right side
    20,975.52x = 453,624,778.66
  5. Step 5: Solve for x
    x = 453,624,778.66/20,975.52
  6. Step 6: Final answer
    x = 21,626.39

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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.