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Finding the Fourth Proportional to 18,674.40, 28,000.80 and 6,988.80

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Solution

The fourth proportional to 18,674.40, 28,000.80 and 6,988.80 is: 10,479.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,674.40 : 28,000.80 = 6,988.80 : x
  2. Step 2: Convert to fraction form
    18,674.40/28,000.80 = 6,988.80/x
  3. Step 3: Cross multiply
    18,674.40x = 28,000.80 × 6,988.80
  4. Step 4: Simplify right side
    18,674.40x = 195,691,991.04
  5. Step 5: Solve for x
    x = 195,691,991.04/18,674.40
  6. Step 6: Final answer
    x = 10,479.16

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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.