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Finding the Fourth Proportional to 89,820.80, 134,500.80 and 85,673.60

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Solution

The fourth proportional to 89,820.80, 134,500.80 and 85,673.60 is: 128,290.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,820.80 : 134,500.80 = 85,673.60 : x
  2. Step 2: Convert to fraction form
    89,820.80/134,500.80 = 85,673.60/x
  3. Step 3: Cross multiply
    89,820.80x = 134,500.80 × 85,673.60
  4. Step 4: Simplify right side
    89,820.80x = 11,523,167,738.88
  5. Step 5: Solve for x
    x = 11,523,167,738.88/89,820.80
  6. Step 6: Final answer
    x = 128,290.64

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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.