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Finding the Fourth Proportional to 107,920.40, 161,880.60 and 81,676.40

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Solution

The fourth proportional to 107,920.40, 161,880.60 and 81,676.40 is: 122,514.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,920.40 : 161,880.60 = 81,676.40 : x
  2. Step 2: Convert to fraction form
    107,920.40/161,880.60 = 81,676.40/x
  3. Step 3: Cross multiply
    107,920.40x = 161,880.60 × 81,676.40
  4. Step 4: Simplify right side
    107,920.40x = 13,221,824,637.84
  5. Step 5: Solve for x
    x = 13,221,824,637.84/107,920.40
  6. Step 6: Final answer
    x = 122,514.60

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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.