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Finding the Fourth Proportional to 100,350.60, 138,490.04 and 55,638.60

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Solution

The fourth proportional to 100,350.60, 138,490.04 and 55,638.60 is: 76,784.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,350.60 : 138,490.04 = 55,638.60 : x
  2. Step 2: Convert to fraction form
    100,350.60/138,490.04 = 55,638.60/x
  3. Step 3: Cross multiply
    100,350.60x = 138,490.04 × 55,638.60
  4. Step 4: Simplify right side
    100,350.60x = 7,705,391,939.54
  5. Step 5: Solve for x
    x = 7,705,391,939.54/100,350.60
  6. Step 6: Final answer
    x = 76,784.71

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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.