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Finding the Fourth Proportional to 85,408.45, 128,190.41 and 45,460.98

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Solution

The fourth proportional to 85,408.45, 128,190.41 and 45,460.98 is: 68,232.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,408.45 : 128,190.41 = 45,460.98 : x
  2. Step 2: Convert to fraction form
    85,408.45/128,190.41 = 45,460.98/x
  3. Step 3: Cross multiply
    85,408.45x = 128,190.41 × 45,460.98
  4. Step 4: Simplify right side
    85,408.45x = 5,827,661,665.20
  5. Step 5: Solve for x
    x = 5,827,661,665.20/85,408.45
  6. Step 6: Final answer
    x = 68,232.85

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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.