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Finding the Fourth Proportional to 154,912.78, 213,762.05 and 86,915.57

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Solution

The fourth proportional to 154,912.78, 213,762.05 and 86,915.57 is: 119,933.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,912.78 : 213,762.05 = 86,915.57 : x
  2. Step 2: Convert to fraction form
    154,912.78/213,762.05 = 86,915.57/x
  3. Step 3: Cross multiply
    154,912.78x = 213,762.05 × 86,915.57
  4. Step 4: Simplify right side
    154,912.78x = 18,579,250,420.12
  5. Step 5: Solve for x
    x = 18,579,250,420.12/154,912.78
  6. Step 6: Final answer
    x = 119,933.62

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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.