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Finding the Fourth Proportional to 18,858.34, 28,291.15 and 7,170.65

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Solution

The fourth proportional to 18,858.34, 28,291.15 and 7,170.65 is: 10,757.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858.34 : 28,291.15 = 7,170.65 : x
  2. Step 2: Convert to fraction form
    18,858.34/28,291.15 = 7,170.65/x
  3. Step 3: Cross multiply
    18,858.34x = 28,291.15 × 7,170.65
  4. Step 4: Simplify right side
    18,858.34x = 202,865,775.37
  5. Step 5: Solve for x
    x = 202,865,775.37/18,858.34
  6. Step 6: Final answer
    x = 10,757.35

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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.