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Finding the Fourth Proportional to 85,676.10, 128,550.60 and 54,110.40

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Solution

The fourth proportional to 85,676.10, 128,550.60 and 54,110.40 is: 81,188.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,676.10 : 128,550.60 = 54,110.40 : x
  2. Step 2: Convert to fraction form
    85,676.10/128,550.60 = 54,110.40/x
  3. Step 3: Cross multiply
    85,676.10x = 128,550.60 × 54,110.40
  4. Step 4: Simplify right side
    85,676.10x = 6,955,924,386.24
  5. Step 5: Solve for x
    x = 6,955,924,386.24/85,676.10
  6. Step 6: Final answer
    x = 81,188.62

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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.