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Finding the Fourth Proportional to 18,685.40, 28,038.90 and 6,999.80

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Solution

The fourth proportional to 18,685.40, 28,038.90 and 6,999.80 is: 10,503.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.40 : 28,038.90 = 6,999.80 : x
  2. Step 2: Convert to fraction form
    18,685.40/28,038.90 = 6,999.80/x
  3. Step 3: Cross multiply
    18,685.40x = 28,038.90 × 6,999.80
  4. Step 4: Simplify right side
    18,685.40x = 196,266,692.22
  5. Step 5: Solve for x
    x = 196,266,692.22/18,685.40
  6. Step 6: Final answer
    x = 10,503.75

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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.