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Finding the Fourth Proportional to 85,673.20, 128,218.20 and 75,175.60

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Solution

The fourth proportional to 85,673.20, 128,218.20 and 75,175.60 is: 112,507.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,673.20 : 128,218.20 = 75,175.60 : x
  2. Step 2: Convert to fraction form
    85,673.20/128,218.20 = 75,175.60/x
  3. Step 3: Cross multiply
    85,673.20x = 128,218.20 × 75,175.60
  4. Step 4: Simplify right side
    85,673.20x = 9,638,880,115.92
  5. Step 5: Solve for x
    x = 9,638,880,115.92/85,673.20
  6. Step 6: Final answer
    x = 112,507.53

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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.