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Finding the Fourth Proportional to 128,625.80, 192,938.70 and 86,635.40

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Solution

The fourth proportional to 128,625.80, 192,938.70 and 86,635.40 is: 129,953.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,625.80 : 192,938.70 = 86,635.40 : x
  2. Step 2: Convert to fraction form
    128,625.80/192,938.70 = 86,635.40/x
  3. Step 3: Cross multiply
    128,625.80x = 192,938.70 × 86,635.40
  4. Step 4: Simplify right side
    128,625.80x = 16,715,321,449.98
  5. Step 5: Solve for x
    x = 16,715,321,449.98/128,625.80
  6. Step 6: Final answer
    x = 129,953.10

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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.