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Finding the Fourth Proportional to 85,982.78, 128,974.07 and 56,393.69

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Solution

The fourth proportional to 85,982.78, 128,974.07 and 56,393.69 is: 84,590.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,982.78 : 128,974.07 = 56,393.69 : x
  2. Step 2: Convert to fraction form
    85,982.78/128,974.07 = 56,393.69/x
  3. Step 3: Cross multiply
    85,982.78x = 128,974.07 × 56,393.69
  4. Step 4: Simplify right side
    85,982.78x = 7,273,323,217.73
  5. Step 5: Solve for x
    x = 7,273,323,217.73/85,982.78
  6. Step 6: Final answer
    x = 84,590.46

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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.