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Finding the Fourth Proportional to 100,200.79, 138,279.17 and 54,880.68

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Solution

The fourth proportional to 100,200.79, 138,279.17 and 54,880.68 is: 75,736.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,200.79 : 138,279.17 = 54,880.68 : x
  2. Step 2: Convert to fraction form
    100,200.79/138,279.17 = 54,880.68/x
  3. Step 3: Cross multiply
    100,200.79x = 138,279.17 × 54,880.68
  4. Step 4: Simplify right side
    100,200.79x = 7,588,855,016.64
  5. Step 5: Solve for x
    x = 7,588,855,016.64/100,200.79
  6. Step 6: Final answer
    x = 75,736.48

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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.