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Finding the Fourth Proportional to 985.08, 1,358.82 and 838.56

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Solution

The fourth proportional to 985.08, 1,358.82 and 838.56 is: 1,156.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.08 : 1,358.82 = 838.56 : x
  2. Step 2: Convert to fraction form
    985.08/1,358.82 = 838.56/x
  3. Step 3: Cross multiply
    985.08x = 1,358.82 × 838.56
  4. Step 4: Simplify right side
    985.08x = 1,139,452.10
  5. Step 5: Solve for x
    x = 1,139,452.10/985.08
  6. Step 6: Final answer
    x = 1,156.71

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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.