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Finding the Fourth Proportional to 103,999.20, 155,998.80 and 103,221.60

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Solution

The fourth proportional to 103,999.20, 155,998.80 and 103,221.60 is: 154,832.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,999.20 : 155,998.80 = 103,221.60 : x
  2. Step 2: Convert to fraction form
    103,999.20/155,998.80 = 103,221.60/x
  3. Step 3: Cross multiply
    103,999.20x = 155,998.80 × 103,221.60
  4. Step 4: Simplify right side
    103,999.20x = 16,102,445,734.08
  5. Step 5: Solve for x
    x = 16,102,445,734.08/103,999.20
  6. Step 6: Final answer
    x = 154,832.40

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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.