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Finding the Fourth Proportional to 76,957.70, 115,436.55 and 68,663.30

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Solution

The fourth proportional to 76,957.70, 115,436.55 and 68,663.30 is: 102,994.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,957.70 : 115,436.55 = 68,663.30 : x
  2. Step 2: Convert to fraction form
    76,957.70/115,436.55 = 68,663.30/x
  3. Step 3: Cross multiply
    76,957.70x = 115,436.55 × 68,663.30
  4. Step 4: Simplify right side
    76,957.70x = 7,926,254,463.62
  5. Step 5: Solve for x
    x = 7,926,254,463.62/76,957.70
  6. Step 6: Final answer
    x = 102,994.95

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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.