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Finding the Fourth Proportional to 1,138.11, 1,707.26 and 407.76

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Solution

The fourth proportional to 1,138.11, 1,707.26 and 407.76 is: 611.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.11 : 1,707.26 = 407.76 : x
  2. Step 2: Convert to fraction form
    1,138.11/1,707.26 = 407.76/x
  3. Step 3: Cross multiply
    1,138.11x = 1,707.26 × 407.76
  4. Step 4: Simplify right side
    1,138.11x = 696,150.30
  5. Step 5: Solve for x
    x = 696,150.30/1,138.11
  6. Step 6: Final answer
    x = 611.67

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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.