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Finding the Fourth Proportional to 85,419, 127,968.12 and 78,974.64

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Solution

The fourth proportional to 85,419, 127,968.12 and 78,974.64 is: 118,313.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,419 : 127,968.12 = 78,974.64 : x
  2. Step 2: Convert to fraction form
    85,419/127,968.12 = 78,974.64/x
  3. Step 3: Cross multiply
    85,419x = 127,968.12 × 78,974.64
  4. Step 4: Simplify right side
    85,419x = 10,106,236,208.48
  5. Step 5: Solve for x
    x = 10,106,236,208.48/85,419
  6. Step 6: Final answer
    x = 118,313.68

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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.