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Finding the Fourth Proportional to 18,842.40, 28,263.60 and 10,072.80

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Solution

The fourth proportional to 18,842.40, 28,263.60 and 10,072.80 is: 15,109.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,842.40 : 28,263.60 = 10,072.80 : x
  2. Step 2: Convert to fraction form
    18,842.40/28,263.60 = 10,072.80/x
  3. Step 3: Cross multiply
    18,842.40x = 28,263.60 × 10,072.80
  4. Step 4: Simplify right side
    18,842.40x = 284,693,590.08
  5. Step 5: Solve for x
    x = 284,693,590.08/18,842.40
  6. Step 6: Final answer
    x = 15,109.20

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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.