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Finding the Fourth Proportional to 100,708.70, 138,979.60 and 55,388.66

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Solution

The fourth proportional to 100,708.70, 138,979.60 and 55,388.66 is: 76,437.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,708.70 : 138,979.60 = 55,388.66 : x
  2. Step 2: Convert to fraction form
    100,708.70/138,979.60 = 55,388.66/x
  3. Step 3: Cross multiply
    100,708.70x = 138,979.60 × 55,388.66
  4. Step 4: Simplify right side
    100,708.70x = 7,697,893,811.34
  5. Step 5: Solve for x
    x = 7,697,893,811.34/100,708.70
  6. Step 6: Final answer
    x = 76,437.23

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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.