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Finding the Fourth Proportional to 76,913.40, 115,272.90 and 68,554.20

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Solution

The fourth proportional to 76,913.40, 115,272.90 and 68,554.20 is: 102,744.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,913.40 : 115,272.90 = 68,554.20 : x
  2. Step 2: Convert to fraction form
    76,913.40/115,272.90 = 68,554.20/x
  3. Step 3: Cross multiply
    76,913.40x = 115,272.90 × 68,554.20
  4. Step 4: Simplify right side
    76,913.40x = 7,902,441,441.18
  5. Step 5: Solve for x
    x = 7,902,441,441.18/76,913.40
  6. Step 6: Final answer
    x = 102,744.66

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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.