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Finding the Fourth Proportional to 18,679.60, 28,019.40 and 12,774.70

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Solution

The fourth proportional to 18,679.60, 28,019.40 and 12,774.70 is: 19,162.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.60 : 28,019.40 = 12,774.70 : x
  2. Step 2: Convert to fraction form
    18,679.60/28,019.40 = 12,774.70/x
  3. Step 3: Cross multiply
    18,679.60x = 28,019.40 × 12,774.70
  4. Step 4: Simplify right side
    18,679.60x = 357,939,429.18
  5. Step 5: Solve for x
    x = 357,939,429.18/18,679.60
  6. Step 6: Final answer
    x = 19,162.05

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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.