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Finding the Fourth Proportional to 138,048.60, 207,072.90 and 100,869.60

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Solution

The fourth proportional to 138,048.60, 207,072.90 and 100,869.60 is: 151,304.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,048.60 : 207,072.90 = 100,869.60 : x
  2. Step 2: Convert to fraction form
    138,048.60/207,072.90 = 100,869.60/x
  3. Step 3: Cross multiply
    138,048.60x = 207,072.90 × 100,869.60
  4. Step 4: Simplify right side
    138,048.60x = 20,887,360,593.84
  5. Step 5: Solve for x
    x = 20,887,360,593.84/138,048.60
  6. Step 6: Final answer
    x = 151,304.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.