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Finding the Fourth Proportional to 85,609.79, 118,254.39 and 65,712.54

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Solution

The fourth proportional to 85,609.79, 118,254.39 and 65,712.54 is: 90,769.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,609.79 : 118,254.39 = 65,712.54 : x
  2. Step 2: Convert to fraction form
    85,609.79/118,254.39 = 65,712.54/x
  3. Step 3: Cross multiply
    85,609.79x = 118,254.39 × 65,712.54
  4. Step 4: Simplify right side
    85,609.79x = 7,770,796,333.05
  5. Step 5: Solve for x
    x = 7,770,796,333.05/85,609.79
  6. Step 6: Final answer
    x = 90,769.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.