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Finding the Fourth Proportional to 18,940.50, 28,423.71 and 6,628.50

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Solution

The fourth proportional to 18,940.50, 28,423.71 and 6,628.50 is: 9,947.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,940.50 : 28,423.71 = 6,628.50 : x
  2. Step 2: Convert to fraction form
    18,940.50/28,423.71 = 6,628.50/x
  3. Step 3: Cross multiply
    18,940.50x = 28,423.71 × 6,628.50
  4. Step 4: Simplify right side
    18,940.50x = 188,406,561.74
  5. Step 5: Solve for x
    x = 188,406,561.74/18,940.50
  6. Step 6: Final answer
    x = 9,947.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.