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Finding the Fourth Proportional to 128,238, 176,968.44 and 71,654.64

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Solution

The fourth proportional to 128,238, 176,968.44 and 71,654.64 is: 98,883.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,238 : 176,968.44 = 71,654.64 : x
  2. Step 2: Convert to fraction form
    128,238/176,968.44 = 71,654.64/x
  3. Step 3: Cross multiply
    128,238x = 176,968.44 × 71,654.64
  4. Step 4: Simplify right side
    128,238x = 12,680,609,859.56
  5. Step 5: Solve for x
    x = 12,680,609,859.56/128,238
  6. Step 6: Final answer
    x = 98,883.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.