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Finding the Fourth Proportional to 138,428.20, 193,930.70 and 138,428.20

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Solution

The fourth proportional to 138,428.20, 193,930.70 and 138,428.20 is: 193,930.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,428.20 : 193,930.70 = 138,428.20 : x
  2. Step 2: Convert to fraction form
    138,428.20/193,930.70 = 138,428.20/x
  3. Step 3: Cross multiply
    138,428.20x = 193,930.70 × 138,428.20
  4. Step 4: Simplify right side
    138,428.20x = 26,845,477,725.74
  5. Step 5: Solve for x
    x = 26,845,477,725.74/138,428.20
  6. Step 6: Final answer
    x = 193,930.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.