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Finding the Fourth Proportional to 85,894.40, 128,938.80 and 50,853.80

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Solution

The fourth proportional to 85,894.40, 128,938.80 and 50,853.80 is: 76,338.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,894.40 : 128,938.80 = 50,853.80 : x
  2. Step 2: Convert to fraction form
    85,894.40/128,938.80 = 50,853.80/x
  3. Step 3: Cross multiply
    85,894.40x = 128,938.80 × 50,853.80
  4. Step 4: Simplify right side
    85,894.40x = 6,557,027,947.44
  5. Step 5: Solve for x
    x = 6,557,027,947.44/85,894.40
  6. Step 6: Final answer
    x = 76,338.25

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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.