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Finding the Fourth Proportional to 128,211.60, 192,315.60 and 58,090.80

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Solution

The fourth proportional to 128,211.60, 192,315.60 and 58,090.80 is: 87,135.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,211.60 : 192,315.60 = 58,090.80 : x
  2. Step 2: Convert to fraction form
    128,211.60/192,315.60 = 58,090.80/x
  3. Step 3: Cross multiply
    128,211.60x = 192,315.60 × 58,090.80
  4. Step 4: Simplify right side
    128,211.60x = 11,171,767,056.48
  5. Step 5: Solve for x
    x = 11,171,767,056.48/128,211.60
  6. Step 6: Final answer
    x = 87,135.38

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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.