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Finding the Fourth Proportional to 3,938.79, 5,909.13 and 1,127.67

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Solution

The fourth proportional to 3,938.79, 5,909.13 and 1,127.67 is: 1,691.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,938.79 : 5,909.13 = 1,127.67 : x
  2. Step 2: Convert to fraction form
    3,938.79/5,909.13 = 1,127.67/x
  3. Step 3: Cross multiply
    3,938.79x = 5,909.13 × 1,127.67
  4. Step 4: Simplify right side
    3,938.79x = 6,663,536.67
  5. Step 5: Solve for x
    x = 6,663,536.67/3,938.79
  6. Step 6: Final answer
    x = 1,691.77

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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.