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Finding the Fourth Proportional to 85,408.80, 128,753.88 and 79,700

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Solution

The fourth proportional to 85,408.80, 128,753.88 and 79,700 is: 120,147.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,408.80 : 128,753.88 = 79,700 : x
  2. Step 2: Convert to fraction form
    85,408.80/128,753.88 = 79,700/x
  3. Step 3: Cross multiply
    85,408.80x = 128,753.88 × 79,700
  4. Step 4: Simplify right side
    85,408.80x = 10,261,684,236
  5. Step 5: Solve for x
    x = 10,261,684,236/85,408.80
  6. Step 6: Final answer
    x = 120,147.86

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.