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Finding the Fourth Proportional to 99,997.80, 138,100.26 and 86,504.20

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Solution

The fourth proportional to 99,997.80, 138,100.26 and 86,504.20 is: 119,465.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,997.80 : 138,100.26 = 86,504.20 : x
  2. Step 2: Convert to fraction form
    99,997.80/138,100.26 = 86,504.20/x
  3. Step 3: Cross multiply
    99,997.80x = 138,100.26 × 86,504.20
  4. Step 4: Simplify right side
    99,997.80x = 11,946,252,511.09
  5. Step 5: Solve for x
    x = 11,946,252,511.09/99,997.80
  6. Step 6: Final answer
    x = 119,465.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.