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Finding the Fourth Proportional to 138,609.40, 207,395.10 and 98,720.60

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Solution

The fourth proportional to 138,609.40, 207,395.10 and 98,720.60 is: 147,711.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,609.40 : 207,395.10 = 98,720.60 : x
  2. Step 2: Convert to fraction form
    138,609.40/207,395.10 = 98,720.60/x
  3. Step 3: Cross multiply
    138,609.40x = 207,395.10 × 98,720.60
  4. Step 4: Simplify right side
    138,609.40x = 20,474,168,709.06
  5. Step 5: Solve for x
    x = 20,474,168,709.06/138,609.40
  6. Step 6: Final answer
    x = 147,711.26

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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.