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Finding the Fourth Proportional to 111,689.70, 154,154.20 and 66,358.95

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Solution

The fourth proportional to 111,689.70, 154,154.20 and 66,358.95 is: 91,588.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,689.70 : 154,154.20 = 66,358.95 : x
  2. Step 2: Convert to fraction form
    111,689.70/154,154.20 = 66,358.95/x
  3. Step 3: Cross multiply
    111,689.70x = 154,154.20 × 66,358.95
  4. Step 4: Simplify right side
    111,689.70x = 10,229,511,235.48
  5. Step 5: Solve for x
    x = 10,229,511,235.48/111,689.70
  6. Step 6: Final answer
    x = 91,588.67

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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.