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Finding the Fourth Proportional to 128,543.70, 192,734.55 and 53,715.90

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Solution

The fourth proportional to 128,543.70, 192,734.55 and 53,715.90 is: 80,540.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,543.70 : 192,734.55 = 53,715.90 : x
  2. Step 2: Convert to fraction form
    128,543.70/192,734.55 = 53,715.90/x
  3. Step 3: Cross multiply
    128,543.70x = 192,734.55 × 53,715.90
  4. Step 4: Simplify right side
    128,543.70x = 10,352,909,814.35
  5. Step 5: Solve for x
    x = 10,352,909,814.35/128,543.70
  6. Step 6: Final answer
    x = 80,540.00

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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.