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Finding the Fourth Proportional to 140,419.40, 210,629.10 and 81,370.40

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Solution

The fourth proportional to 140,419.40, 210,629.10 and 81,370.40 is: 122,055.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,419.40 : 210,629.10 = 81,370.40 : x
  2. Step 2: Convert to fraction form
    140,419.40/210,629.10 = 81,370.40/x
  3. Step 3: Cross multiply
    140,419.40x = 210,629.10 × 81,370.40
  4. Step 4: Simplify right side
    140,419.40x = 17,138,974,118.64
  5. Step 5: Solve for x
    x = 17,138,974,118.64/140,419.40
  6. Step 6: Final answer
    x = 122,055.60

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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.