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Finding the Fourth Proportional to 128,319.90, 192,807.90 and 113,885.70

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Solution

The fourth proportional to 128,319.90, 192,807.90 and 113,885.70 is: 171,119.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,319.90 : 192,807.90 = 113,885.70 : x
  2. Step 2: Convert to fraction form
    128,319.90/192,807.90 = 113,885.70/x
  3. Step 3: Cross multiply
    128,319.90x = 192,807.90 × 113,885.70
  4. Step 4: Simplify right side
    128,319.90x = 21,958,062,657.03
  5. Step 5: Solve for x
    x = 21,958,062,657.03/128,319.90
  6. Step 6: Final answer
    x = 171,119.70

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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.