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Finding the Fourth Proportional to 138,212.40, 190,558.64 and 90,390

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Solution

The fourth proportional to 138,212.40, 190,558.64 and 90,390 is: 124,624.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,212.40 : 190,558.64 = 90,390 : x
  2. Step 2: Convert to fraction form
    138,212.40/190,558.64 = 90,390/x
  3. Step 3: Cross multiply
    138,212.40x = 190,558.64 × 90,390
  4. Step 4: Simplify right side
    138,212.40x = 17,224,595,469.60
  5. Step 5: Solve for x
    x = 17,224,595,469.60/138,212.40
  6. Step 6: Final answer
    x = 124,624.10

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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.