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Finding the Fourth Proportional to 138,609.40, 207,914.10 and 124,612.60

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Solution

The fourth proportional to 138,609.40, 207,914.10 and 124,612.60 is: 186,918.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,609.40 : 207,914.10 = 124,612.60 : x
  2. Step 2: Convert to fraction form
    138,609.40/207,914.10 = 124,612.60/x
  3. Step 3: Cross multiply
    138,609.40x = 207,914.10 × 124,612.60
  4. Step 4: Simplify right side
    138,609.40x = 25,908,716,577.66
  5. Step 5: Solve for x
    x = 25,908,716,577.66/138,609.40
  6. Step 6: Final answer
    x = 186,918.90

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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.