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Finding the Fourth Proportional to 85,679.64, 128,519.87 and 26,515.62

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Solution

The fourth proportional to 85,679.64, 128,519.87 and 26,515.62 is: 39,773.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,679.64 : 128,519.87 = 26,515.62 : x
  2. Step 2: Convert to fraction form
    85,679.64/128,519.87 = 26,515.62/x
  3. Step 3: Cross multiply
    85,679.64x = 128,519.87 × 26,515.62
  4. Step 4: Simplify right side
    85,679.64x = 3,407,783,902.79
  5. Step 5: Solve for x
    x = 3,407,783,902.79/85,679.64
  6. Step 6: Final answer
    x = 39,773.56

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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.