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Finding the Fourth Proportional to 100,375.51, 138,522.08 and 55,055.40

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Solution

The fourth proportional to 100,375.51, 138,522.08 and 55,055.40 is: 75,978.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,375.51 : 138,522.08 = 55,055.40 : x
  2. Step 2: Convert to fraction form
    100,375.51/138,522.08 = 55,055.40/x
  3. Step 3: Cross multiply
    100,375.51x = 138,522.08 × 55,055.40
  4. Step 4: Simplify right side
    100,375.51x = 7,626,389,180.33
  5. Step 5: Solve for x
    x = 7,626,389,180.33/100,375.51
  6. Step 6: Final answer
    x = 75,978.58

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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.