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Finding the Fourth Proportional to 100,638.86, 138,884.76 and 55,320.32

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Solution

The fourth proportional to 100,638.86, 138,884.76 and 55,320.32 is: 76,343.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,638.86 : 138,884.76 = 55,320.32 : x
  2. Step 2: Convert to fraction form
    100,638.86/138,884.76 = 55,320.32/x
  3. Step 3: Cross multiply
    100,638.86x = 138,884.76 × 55,320.32
  4. Step 4: Simplify right side
    100,638.86x = 7,683,149,713.54
  5. Step 5: Solve for x
    x = 7,683,149,713.54/100,638.86
  6. Step 6: Final answer
    x = 76,343.77

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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.