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Finding the Fourth Proportional to 89,641.20, 134,461.80 and 85,704.60

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Solution

The fourth proportional to 89,641.20, 134,461.80 and 85,704.60 is: 128,556.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,641.20 : 134,461.80 = 85,704.60 : x
  2. Step 2: Convert to fraction form
    89,641.20/134,461.80 = 85,704.60/x
  3. Step 3: Cross multiply
    89,641.20x = 134,461.80 × 85,704.60
  4. Step 4: Simplify right side
    89,641.20x = 11,523,994,784.28
  5. Step 5: Solve for x
    x = 11,523,994,784.28/89,641.20
  6. Step 6: Final answer
    x = 128,556.90

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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.