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Finding the Fourth Proportional to 85,338.75, 127,912.75 and 31,979.40

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Solution

The fourth proportional to 85,338.75, 127,912.75 and 31,979.40 is: 47,933.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,338.75 : 127,912.75 = 31,979.40 : x
  2. Step 2: Convert to fraction form
    85,338.75/127,912.75 = 31,979.40/x
  3. Step 3: Cross multiply
    85,338.75x = 127,912.75 × 31,979.40
  4. Step 4: Simplify right side
    85,338.75x = 4,090,572,997.35
  5. Step 5: Solve for x
    x = 4,090,572,997.35/85,338.75
  6. Step 6: Final answer
    x = 47,933.36

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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.