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Finding the Fourth Proportional to 128,108, 176,806.68 and 71,522.48

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Solution

The fourth proportional to 128,108, 176,806.68 and 71,522.48 is: 98,710.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,108 : 176,806.68 = 71,522.48 : x
  2. Step 2: Convert to fraction form
    128,108/176,806.68 = 71,522.48/x
  3. Step 3: Cross multiply
    128,108x = 176,806.68 × 71,522.48
  4. Step 4: Simplify right side
    128,108x = 12,645,652,234.17
  5. Step 5: Solve for x
    x = 12,645,652,234.17/128,108
  6. Step 6: Final answer
    x = 98,710.87

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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.