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Finding the Fourth Proportional to 92,419.60, 138,629.40 and 86,587.60

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Solution

The fourth proportional to 92,419.60, 138,629.40 and 86,587.60 is: 129,881.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,419.60 : 138,629.40 = 86,587.60 : x
  2. Step 2: Convert to fraction form
    92,419.60/138,629.40 = 86,587.60/x
  3. Step 3: Cross multiply
    92,419.60x = 138,629.40 × 86,587.60
  4. Step 4: Simplify right side
    92,419.60x = 12,003,587,035.44
  5. Step 5: Solve for x
    x = 12,003,587,035.44/92,419.60
  6. Step 6: Final answer
    x = 129,881.40

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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.