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Finding the Fourth Proportional to 18,917.80, 28,376.70 and 13,280.20

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Solution

The fourth proportional to 18,917.80, 28,376.70 and 13,280.20 is: 19,920.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.80 : 28,376.70 = 13,280.20 : x
  2. Step 2: Convert to fraction form
    18,917.80/28,376.70 = 13,280.20/x
  3. Step 3: Cross multiply
    18,917.80x = 28,376.70 × 13,280.20
  4. Step 4: Simplify right side
    18,917.80x = 376,848,251.34
  5. Step 5: Solve for x
    x = 376,848,251.34/18,917.80
  6. Step 6: Final answer
    x = 19,920.30

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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.