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Finding the Fourth Proportional to 13,995.60, 21,009.60 and 8,455.20

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Solution

The fourth proportional to 13,995.60, 21,009.60 and 8,455.20 is: 12,692.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,995.60 : 21,009.60 = 8,455.20 : x
  2. Step 2: Convert to fraction form
    13,995.60/21,009.60 = 8,455.20/x
  3. Step 3: Cross multiply
    13,995.60x = 21,009.60 × 8,455.20
  4. Step 4: Simplify right side
    13,995.60x = 177,640,369.92
  5. Step 5: Solve for x
    x = 177,640,369.92/13,995.60
  6. Step 6: Final answer
    x = 12,692.59

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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.