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Finding the Fourth Proportional to 128,554.92, 177,395.94 and 71,958.60

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Solution

The fourth proportional to 128,554.92, 177,395.94 and 71,958.60 is: 99,297.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,554.92 : 177,395.94 = 71,958.60 : x
  2. Step 2: Convert to fraction form
    128,554.92/177,395.94 = 71,958.60/x
  3. Step 3: Cross multiply
    128,554.92x = 177,395.94 × 71,958.60
  4. Step 4: Simplify right side
    128,554.92x = 12,765,163,488.08
  5. Step 5: Solve for x
    x = 12,765,163,488.08/128,554.92
  6. Step 6: Final answer
    x = 99,297.35

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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.