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Finding the Fourth Proportional to 128,046.60, 192,215.70 and 75,485.70

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Solution

The fourth proportional to 128,046.60, 192,215.70 and 75,485.70 is: 113,314.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,046.60 : 192,215.70 = 75,485.70 : x
  2. Step 2: Convert to fraction form
    128,046.60/192,215.70 = 75,485.70/x
  3. Step 3: Cross multiply
    128,046.60x = 192,215.70 × 75,485.70
  4. Step 4: Simplify right side
    128,046.60x = 14,509,536,665.49
  5. Step 5: Solve for x
    x = 14,509,536,665.49/128,046.60
  6. Step 6: Final answer
    x = 113,314.50

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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.