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Finding the Fourth Proportional to 100,662.75, 138,911.06 and 55,340.40

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Solution

The fourth proportional to 100,662.75, 138,911.06 and 55,340.40 is: 76,367.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,662.75 : 138,911.06 = 55,340.40 : x
  2. Step 2: Convert to fraction form
    100,662.75/138,911.06 = 55,340.40/x
  3. Step 3: Cross multiply
    100,662.75x = 138,911.06 × 55,340.40
  4. Step 4: Simplify right side
    100,662.75x = 7,687,393,699.64
  5. Step 5: Solve for x
    x = 7,687,393,699.64/100,662.75
  6. Step 6: Final answer
    x = 76,367.81

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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.