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Finding the Fourth Proportional to 128,791.20, 193,705.20 and 115,312.80

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Solution

The fourth proportional to 128,791.20, 193,705.20 and 115,312.80 is: 173,433.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,791.20 : 193,705.20 = 115,312.80 : x
  2. Step 2: Convert to fraction form
    128,791.20/193,705.20 = 115,312.80/x
  3. Step 3: Cross multiply
    128,791.20x = 193,705.20 × 115,312.80
  4. Step 4: Simplify right side
    128,791.20x = 22,336,688,986.56
  5. Step 5: Solve for x
    x = 22,336,688,986.56/128,791.20
  6. Step 6: Final answer
    x = 173,433.35

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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.