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Finding the Fourth Proportional to 100,384.80, 138,531.24 and 55,063.20

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Solution

The fourth proportional to 100,384.80, 138,531.24 and 55,063.20 is: 75,987.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,384.80 : 138,531.24 = 55,063.20 : x
  2. Step 2: Convert to fraction form
    100,384.80/138,531.24 = 55,063.20/x
  3. Step 3: Cross multiply
    100,384.80x = 138,531.24 × 55,063.20
  4. Step 4: Simplify right side
    100,384.80x = 7,627,973,374.37
  5. Step 5: Solve for x
    x = 7,627,973,374.37/100,384.80
  6. Step 6: Final answer
    x = 75,987.33

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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.