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Finding the Fourth Proportional to 85,968.95, 128,953.43 and 67,306.55

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Solution

The fourth proportional to 85,968.95, 128,953.43 and 67,306.55 is: 100,959.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,968.95 : 128,953.43 = 67,306.55 : x
  2. Step 2: Convert to fraction form
    85,968.95/128,953.43 = 67,306.55/x
  3. Step 3: Cross multiply
    85,968.95x = 128,953.43 × 67,306.55
  4. Step 4: Simplify right side
    85,968.95x = 8,679,410,147.43
  5. Step 5: Solve for x
    x = 8,679,410,147.43/85,968.95
  6. Step 6: Final answer
    x = 100,959.83

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Similar ratio
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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.