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Finding the Fourth Proportional to 128,066.80, 191,855.40 and 68,882.80

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Solution

The fourth proportional to 128,066.80, 191,855.40 and 68,882.80 is: 103,192.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,066.80 : 191,855.40 = 68,882.80 : x
  2. Step 2: Convert to fraction form
    128,066.80/191,855.40 = 68,882.80/x
  3. Step 3: Cross multiply
    128,066.80x = 191,855.40 × 68,882.80
  4. Step 4: Simplify right side
    128,066.80x = 13,215,537,147.12
  5. Step 5: Solve for x
    x = 13,215,537,147.12/128,066.80
  6. Step 6: Final answer
    x = 103,192.53

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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.