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Finding the Fourth Proportional to 128,664.60, 192,996.90 and 86,674.20

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Solution

The fourth proportional to 128,664.60, 192,996.90 and 86,674.20 is: 130,011.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,664.60 : 192,996.90 = 86,674.20 : x
  2. Step 2: Convert to fraction form
    128,664.60/192,996.90 = 86,674.20/x
  3. Step 3: Cross multiply
    128,664.60x = 192,996.90 × 86,674.20
  4. Step 4: Simplify right side
    128,664.60x = 16,727,851,909.98
  5. Step 5: Solve for x
    x = 16,727,851,909.98/128,664.60
  6. Step 6: Final answer
    x = 130,011.30

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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.