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Finding the Fourth Proportional to 128,713.80, 193,070.70 and 86,723.40

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Solution

The fourth proportional to 128,713.80, 193,070.70 and 86,723.40 is: 130,085.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,713.80 : 193,070.70 = 86,723.40 : x
  2. Step 2: Convert to fraction form
    128,713.80/193,070.70 = 86,723.40/x
  3. Step 3: Cross multiply
    128,713.80x = 193,070.70 × 86,723.40
  4. Step 4: Simplify right side
    128,713.80x = 16,743,747,544.38
  5. Step 5: Solve for x
    x = 16,743,747,544.38/128,713.80
  6. Step 6: Final answer
    x = 130,085.10

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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.