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Finding the Fourth Proportional to 81,256.80, 121,647.60 and 57,928.80

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Solution

The fourth proportional to 81,256.80, 121,647.60 and 57,928.80 is: 86,723.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,256.80 : 121,647.60 = 57,928.80 : x
  2. Step 2: Convert to fraction form
    81,256.80/121,647.60 = 57,928.80/x
  3. Step 3: Cross multiply
    81,256.80x = 121,647.60 × 57,928.80
  4. Step 4: Simplify right side
    81,256.80x = 7,046,899,490.88
  5. Step 5: Solve for x
    x = 7,046,899,490.88/81,256.80
  6. Step 6: Final answer
    x = 86,723.81

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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.