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Finding the Fourth Proportional to 85,830.20, 128,891.10 and 63,668.60

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Solution

The fourth proportional to 85,830.20, 128,891.10 and 63,668.60 is: 95,611.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,830.20 : 128,891.10 = 63,668.60 : x
  2. Step 2: Convert to fraction form
    85,830.20/128,891.10 = 63,668.60/x
  3. Step 3: Cross multiply
    85,830.20x = 128,891.10 × 63,668.60
  4. Step 4: Simplify right side
    85,830.20x = 8,206,315,889.46
  5. Step 5: Solve for x
    x = 8,206,315,889.46/85,830.20
  6. Step 6: Final answer
    x = 95,611.05

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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.