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Finding the Fourth Proportional to 85,857.40, 128,786.10 and 54,364.60

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Solution

The fourth proportional to 85,857.40, 128,786.10 and 54,364.60 is: 81,546.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,857.40 : 128,786.10 = 54,364.60 : x
  2. Step 2: Convert to fraction form
    85,857.40/128,786.10 = 54,364.60/x
  3. Step 3: Cross multiply
    85,857.40x = 128,786.10 × 54,364.60
  4. Step 4: Simplify right side
    85,857.40x = 7,001,404,812.06
  5. Step 5: Solve for x
    x = 7,001,404,812.06/85,857.40
  6. Step 6: Final answer
    x = 81,546.90

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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.