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Finding the Fourth Proportional to 100,612.92, 138,845.75 and 55,293.81

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Solution

The fourth proportional to 100,612.92, 138,845.75 and 55,293.81 is: 76,305.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,612.92 : 138,845.75 = 55,293.81 : x
  2. Step 2: Convert to fraction form
    100,612.92/138,845.75 = 55,293.81/x
  3. Step 3: Cross multiply
    100,612.92x = 138,845.75 × 55,293.81
  4. Step 4: Simplify right side
    100,612.92x = 7,677,310,243.34
  5. Step 5: Solve for x
    x = 7,677,310,243.34/100,612.92
  6. Step 6: Final answer
    x = 76,305.41

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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.