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Finding the Fourth Proportional to 128,580.30, 192,433.05 and 112,833.90

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Solution

The fourth proportional to 128,580.30, 192,433.05 and 112,833.90 is: 168,867.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,580.30 : 192,433.05 = 112,833.90 : x
  2. Step 2: Convert to fraction form
    128,580.30/192,433.05 = 112,833.90/x
  3. Step 3: Cross multiply
    128,580.30x = 192,433.05 × 112,833.90
  4. Step 4: Simplify right side
    128,580.30x = 21,712,971,520.40
  5. Step 5: Solve for x
    x = 21,712,971,520.40/128,580.30
  6. Step 6: Final answer
    x = 168,867.02

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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.