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Finding the Fourth Proportional to 85,958.80, 128,938.20 and 57,965.20

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Solution

The fourth proportional to 85,958.80, 128,938.20 and 57,965.20 is: 86,947.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,958.80 : 128,938.20 = 57,965.20 : x
  2. Step 2: Convert to fraction form
    85,958.80/128,938.20 = 57,965.20/x
  3. Step 3: Cross multiply
    85,958.80x = 128,938.20 × 57,965.20
  4. Step 4: Simplify right side
    85,958.80x = 7,473,928,550.64
  5. Step 5: Solve for x
    x = 7,473,928,550.64/85,958.80
  6. Step 6: Final answer
    x = 86,947.80

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Similar ratio
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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.