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Finding the Fourth Proportional to 100,623.28, 138,853.42 and 55,300.32

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Solution

The fourth proportional to 100,623.28, 138,853.42 and 55,300.32 is: 76,310.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,623.28 : 138,853.42 = 55,300.32 : x
  2. Step 2: Convert to fraction form
    100,623.28/138,853.42 = 55,300.32/x
  3. Step 3: Cross multiply
    100,623.28x = 138,853.42 × 55,300.32
  4. Step 4: Simplify right side
    100,623.28x = 7,678,638,559.09
  5. Step 5: Solve for x
    x = 7,678,638,559.09/100,623.28
  6. Step 6: Final answer
    x = 76,310.76

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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.