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Finding the Fourth Proportional to 275,979.60, 413,969.40 and 86,455.80

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Solution

The fourth proportional to 275,979.60, 413,969.40 and 86,455.80 is: 129,683.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,979.60 : 413,969.40 = 86,455.80 : x
  2. Step 2: Convert to fraction form
    275,979.60/413,969.40 = 86,455.80/x
  3. Step 3: Cross multiply
    275,979.60x = 413,969.40 × 86,455.80
  4. Step 4: Simplify right side
    275,979.60x = 35,790,055,652.52
  5. Step 5: Solve for x
    x = 35,790,055,652.52/275,979.60
  6. Step 6: Final answer
    x = 129,683.70

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1.5x scale

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.