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Finding the Fourth Proportional to 85,846.60, 128,769.90 and 79,625.80

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Solution

The fourth proportional to 85,846.60, 128,769.90 and 79,625.80 is: 119,438.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,846.60 : 128,769.90 = 79,625.80 : x
  2. Step 2: Convert to fraction form
    85,846.60/128,769.90 = 79,625.80/x
  3. Step 3: Cross multiply
    85,846.60x = 128,769.90 × 79,625.80
  4. Step 4: Simplify right side
    85,846.60x = 10,253,406,303.42
  5. Step 5: Solve for x
    x = 10,253,406,303.42/85,846.60
  6. Step 6: Final answer
    x = 119,438.70

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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.