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Finding the Fourth Proportional to 18,612.80, 25,999.60 and 18,612.80

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Solution

The fourth proportional to 18,612.80, 25,999.60 and 18,612.80 is: 25,999.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,612.80 : 25,999.60 = 18,612.80 : x
  2. Step 2: Convert to fraction form
    18,612.80/25,999.60 = 18,612.80/x
  3. Step 3: Cross multiply
    18,612.80x = 25,999.60 × 18,612.80
  4. Step 4: Simplify right side
    18,612.80x = 483,925,354.88
  5. Step 5: Solve for x
    x = 483,925,354.88/18,612.80
  6. Step 6: Final answer
    x = 25,999.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.