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Finding the Fourth Proportional to 18,686.40, 28,040.40 and 7,000.80

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Solution

The fourth proportional to 18,686.40, 28,040.40 and 7,000.80 is: 10,505.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.40 : 28,040.40 = 7,000.80 : x
  2. Step 2: Convert to fraction form
    18,686.40/28,040.40 = 7,000.80/x
  3. Step 3: Cross multiply
    18,686.40x = 28,040.40 × 7,000.80
  4. Step 4: Simplify right side
    18,686.40x = 196,305,232.32
  5. Step 5: Solve for x
    x = 196,305,232.32/18,686.40
  6. Step 6: Final answer
    x = 10,505.25

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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.