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Finding the Fourth Proportional to 85,811.20, 128,716.80 and 79,979.20

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Solution

The fourth proportional to 85,811.20, 128,716.80 and 79,979.20 is: 119,968.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,811.20 : 128,716.80 = 79,979.20 : x
  2. Step 2: Convert to fraction form
    85,811.20/128,716.80 = 79,979.20/x
  3. Step 3: Cross multiply
    85,811.20x = 128,716.80 × 79,979.20
  4. Step 4: Simplify right side
    85,811.20x = 10,294,666,690.56
  5. Step 5: Solve for x
    x = 10,294,666,690.56/85,811.20
  6. Step 6: Final answer
    x = 119,968.80

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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.