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Finding the Fourth Proportional to 154,825, 213,660.29 and 85,915.88

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Solution

The fourth proportional to 154,825, 213,660.29 and 85,915.88 is: 118,564.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,825 : 213,660.29 = 85,915.88 : x
  2. Step 2: Convert to fraction form
    154,825/213,660.29 = 85,915.88/x
  3. Step 3: Cross multiply
    154,825x = 213,660.29 × 85,915.88
  4. Step 4: Simplify right side
    154,825x = 18,356,811,836.41
  5. Step 5: Solve for x
    x = 18,356,811,836.41/154,825
  6. Step 6: Final answer
    x = 118,564.91

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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.