Home / 85,720.20-128,288.70-75,222.60

Finding the Fourth Proportional to 85,720.20, 128,288.70 and 75,222.60

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Solution

The fourth proportional to 85,720.20, 128,288.70 and 75,222.60 is: 112,578.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,720.20 : 128,288.70 = 75,222.60 : x
  2. Step 2: Convert to fraction form
    85,720.20/128,288.70 = 75,222.60/x
  3. Step 3: Cross multiply
    85,720.20x = 128,288.70 × 75,222.60
  4. Step 4: Simplify right side
    85,720.20x = 9,650,209,564.62
  5. Step 5: Solve for x
    x = 9,650,209,564.62/85,720.20
  6. Step 6: Final answer
    x = 112,578.01

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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.