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Finding the Fourth Proportional to 100,372.10, 138,513.08 and 55,048.88

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Solution

The fourth proportional to 100,372.10, 138,513.08 and 55,048.88 is: 75,967.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,372.10 : 138,513.08 = 55,048.88 : x
  2. Step 2: Convert to fraction form
    100,372.10/138,513.08 = 55,048.88/x
  3. Step 3: Cross multiply
    100,372.10x = 138,513.08 × 55,048.88
  4. Step 4: Simplify right side
    100,372.10x = 7,624,988,951.54
  5. Step 5: Solve for x
    x = 7,624,988,951.54/100,372.10
  6. Step 6: Final answer
    x = 75,967.22

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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.