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Finding the Fourth Proportional to 85,778.40, 128,696.80 and 54,151.68

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Solution

The fourth proportional to 85,778.40, 128,696.80 and 54,151.68 is: 81,245.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,778.40 : 128,696.80 = 54,151.68 : x
  2. Step 2: Convert to fraction form
    85,778.40/128,696.80 = 54,151.68/x
  3. Step 3: Cross multiply
    85,778.40x = 128,696.80 × 54,151.68
  4. Step 4: Simplify right side
    85,778.40x = 6,969,147,930.62
  5. Step 5: Solve for x
    x = 6,969,147,930.62/85,778.40
  6. Step 6: Final answer
    x = 81,245.95

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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.