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Finding the Fourth Proportional to 128,423.60, 192,635.40 and 91,025.90

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Solution

The fourth proportional to 128,423.60, 192,635.40 and 91,025.90 is: 136,538.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,423.60 : 192,635.40 = 91,025.90 : x
  2. Step 2: Convert to fraction form
    128,423.60/192,635.40 = 91,025.90/x
  3. Step 3: Cross multiply
    128,423.60x = 192,635.40 × 91,025.90
  4. Step 4: Simplify right side
    128,423.60x = 17,534,810,656.86
  5. Step 5: Solve for x
    x = 17,534,810,656.86/128,423.60
  6. Step 6: Final answer
    x = 136,538.85

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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.