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Finding the Fourth Proportional to 85,478.36, 128,255.09 and 45,487.89

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Solution

The fourth proportional to 85,478.36, 128,255.09 and 45,487.89 is: 68,251.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,478.36 : 128,255.09 = 45,487.89 : x
  2. Step 2: Convert to fraction form
    85,478.36/128,255.09 = 45,487.89/x
  3. Step 3: Cross multiply
    85,478.36x = 128,255.09 × 45,487.89
  4. Step 4: Simplify right side
    85,478.36x = 5,834,053,198.42
  5. Step 5: Solve for x
    x = 5,834,053,198.42/85,478.36
  6. Step 6: Final answer
    x = 68,251.82

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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.