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Finding the Fourth Proportional to 85,401.60, 128,102.40 and 79,180.80

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Solution

The fourth proportional to 85,401.60, 128,102.40 and 79,180.80 is: 118,771.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,401.60 : 128,102.40 = 79,180.80 : x
  2. Step 2: Convert to fraction form
    85,401.60/128,102.40 = 79,180.80/x
  3. Step 3: Cross multiply
    85,401.60x = 128,102.40 × 79,180.80
  4. Step 4: Simplify right side
    85,401.60x = 10,143,250,513.92
  5. Step 5: Solve for x
    x = 10,143,250,513.92/85,401.60
  6. Step 6: Final answer
    x = 118,771.20

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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.