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Finding the Fourth Proportional to 128,998.20, 193,205.70 and 76,510.20

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Solution

The fourth proportional to 128,998.20, 193,205.70 and 76,510.20 is: 114,592.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,998.20 : 193,205.70 = 76,510.20 : x
  2. Step 2: Convert to fraction form
    128,998.20/193,205.70 = 76,510.20/x
  3. Step 3: Cross multiply
    128,998.20x = 193,205.70 × 76,510.20
  4. Step 4: Simplify right side
    128,998.20x = 14,782,206,748.14
  5. Step 5: Solve for x
    x = 14,782,206,748.14/128,998.20
  6. Step 6: Final answer
    x = 114,592.35

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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.