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Finding the Fourth Proportional to 18,515.80, 27,773.70 and 12,878.20

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Solution

The fourth proportional to 18,515.80, 27,773.70 and 12,878.20 is: 19,317.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,515.80 : 27,773.70 = 12,878.20 : x
  2. Step 2: Convert to fraction form
    18,515.80/27,773.70 = 12,878.20/x
  3. Step 3: Cross multiply
    18,515.80x = 27,773.70 × 12,878.20
  4. Step 4: Simplify right side
    18,515.80x = 357,675,263.34
  5. Step 5: Solve for x
    x = 357,675,263.34/18,515.80
  6. Step 6: Final answer
    x = 19,317.30

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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.