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Finding the Fourth Proportional to 154,989.91, 213,885.97 and 87,007.01

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Solution

The fourth proportional to 154,989.91, 213,885.97 and 87,007.01 is: 120,069.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,989.91 : 213,885.97 = 87,007.01 : x
  2. Step 2: Convert to fraction form
    154,989.91/213,885.97 = 87,007.01/x
  3. Step 3: Cross multiply
    154,989.91x = 213,885.97 × 87,007.01
  4. Step 4: Simplify right side
    154,989.91x = 18,609,579,047.85
  5. Step 5: Solve for x
    x = 18,609,579,047.85/154,989.91
  6. Step 6: Final answer
    x = 120,069.62

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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.