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Finding the Fourth Proportional to 100,393.71, 138,546.32 and 55,680.75

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Solution

The fourth proportional to 100,393.71, 138,546.32 and 55,680.75 is: 76,841.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,393.71 : 138,546.32 = 55,680.75 : x
  2. Step 2: Convert to fraction form
    100,393.71/138,546.32 = 55,680.75/x
  3. Step 3: Cross multiply
    100,393.71x = 138,546.32 × 55,680.75
  4. Step 4: Simplify right side
    100,393.71x = 7,714,362,728.94
  5. Step 5: Solve for x
    x = 7,714,362,728.94/100,393.71
  6. Step 6: Final answer
    x = 76,841.10

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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.