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Finding the Fourth Proportional to 18,858.84, 28,291.90 and 7,171.15

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Solution

The fourth proportional to 18,858.84, 28,291.90 and 7,171.15 is: 10,758.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858.84 : 28,291.90 = 7,171.15 : x
  2. Step 2: Convert to fraction form
    18,858.84/28,291.90 = 7,171.15/x
  3. Step 3: Cross multiply
    18,858.84x = 28,291.90 × 7,171.15
  4. Step 4: Simplify right side
    18,858.84x = 202,885,317.23
  5. Step 5: Solve for x
    x = 202,885,317.23/18,858.84
  6. Step 6: Final answer
    x = 10,758.10

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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.