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Finding the Fourth Proportional to 18,647.60, 28,003.80 and 9,899.60

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Solution

The fourth proportional to 18,647.60, 28,003.80 and 9,899.60 is: 14,866.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,647.60 : 28,003.80 = 9,899.60 : x
  2. Step 2: Convert to fraction form
    18,647.60/28,003.80 = 9,899.60/x
  3. Step 3: Cross multiply
    18,647.60x = 28,003.80 × 9,899.60
  4. Step 4: Simplify right side
    18,647.60x = 277,226,418.48
  5. Step 5: Solve for x
    x = 277,226,418.48/18,647.60
  6. Step 6: Final answer
    x = 14,866.60

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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.