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Finding the Fourth Proportional to 84,391,999.80, 126,587,999.70 and 80,990,777.40

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Solution

The fourth proportional to 84,391,999.80, 126,587,999.70 and 80,990,777.40 is: 121,486,166.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,391,999.80 : 126,587,999.70 = 80,990,777.40 : x
  2. Step 2: Convert to fraction form
    84,391,999.80/126,587,999.70 = 80,990,777.40/x
  3. Step 3: Cross multiply
    84,391,999.80x = 126,587,999.70 × 80,990,777.40
  4. Step 4: Simplify right side
    84,391,999.80x = 10,252,460,505,213,968
  5. Step 5: Solve for x
    x = 10,252,460,505,213,968/84,391,999.80
  6. Step 6: Final answer
    x = 121,486,166.10

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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.