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Finding the Fourth Proportional to 85,855.20, 128,491.20 and 75,357.60

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Solution

The fourth proportional to 85,855.20, 128,491.20 and 75,357.60 is: 112,780.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,855.20 : 128,491.20 = 75,357.60 : x
  2. Step 2: Convert to fraction form
    85,855.20/128,491.20 = 75,357.60/x
  3. Step 3: Cross multiply
    85,855.20x = 128,491.20 × 75,357.60
  4. Step 4: Simplify right side
    85,855.20x = 9,682,788,453.12
  5. Step 5: Solve for x
    x = 9,682,788,453.12/85,855.20
  6. Step 6: Final answer
    x = 112,780.45

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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.