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Finding the Fourth Proportional to 102,960.80, 154,138.80 and 76,781.60

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Solution

The fourth proportional to 102,960.80, 154,138.80 and 76,781.60 is: 114,946.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,960.80 : 154,138.80 = 76,781.60 : x
  2. Step 2: Convert to fraction form
    102,960.80/154,138.80 = 76,781.60/x
  3. Step 3: Cross multiply
    102,960.80x = 154,138.80 × 76,781.60
  4. Step 4: Simplify right side
    102,960.80x = 11,835,023,686.08
  5. Step 5: Solve for x
    x = 11,835,023,686.08/102,960.80
  6. Step 6: Final answer
    x = 114,946.89

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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.