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Finding the Fourth Proportional to 985.43, 1,359.11 and 611.71

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Solution

The fourth proportional to 985.43, 1,359.11 and 611.71 is: 843.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.43 : 1,359.11 = 611.71 : x
  2. Step 2: Convert to fraction form
    985.43/1,359.11 = 611.71/x
  3. Step 3: Cross multiply
    985.43x = 1,359.11 × 611.71
  4. Step 4: Simplify right side
    985.43x = 831,379.31
  5. Step 5: Solve for x
    x = 831,379.31/985.43
  6. Step 6: Final answer
    x = 843.67

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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.