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Finding the Fourth Proportional to 85,745.82, 128,572.34 and 68,090.07

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Solution

The fourth proportional to 85,745.82, 128,572.34 and 68,090.07 is: 102,098.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,745.82 : 128,572.34 = 68,090.07 : x
  2. Step 2: Convert to fraction form
    85,745.82/128,572.34 = 68,090.07/x
  3. Step 3: Cross multiply
    85,745.82x = 128,572.34 × 68,090.07
  4. Step 4: Simplify right side
    85,745.82x = 8,754,499,630.66
  5. Step 5: Solve for x
    x = 8,754,499,630.66/85,745.82
  6. Step 6: Final answer
    x = 102,098.27

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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.