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Finding the Fourth Proportional to 205,305.40, 307,914.90 and 86,980.60

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Solution

The fourth proportional to 205,305.40, 307,914.90 and 86,980.60 is: 130,452.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,305.40 : 307,914.90 = 86,980.60 : x
  2. Step 2: Convert to fraction form
    205,305.40/307,914.90 = 86,980.60/x
  3. Step 3: Cross multiply
    205,305.40x = 307,914.90 × 86,980.60
  4. Step 4: Simplify right side
    205,305.40x = 26,782,622,750.94
  5. Step 5: Solve for x
    x = 26,782,622,750.94/205,305.40
  6. Step 6: Final answer
    x = 130,452.60

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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.