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Finding the Fourth Proportional to 949.86, 1,311.03 and 687.42

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Solution

The fourth proportional to 949.86, 1,311.03 and 687.42 is: 948.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.86 : 1,311.03 = 687.42 : x
  2. Step 2: Convert to fraction form
    949.86/1,311.03 = 687.42/x
  3. Step 3: Cross multiply
    949.86x = 1,311.03 × 687.42
  4. Step 4: Simplify right side
    949.86x = 901,228.24
  5. Step 5: Solve for x
    x = 901,228.24/949.86
  6. Step 6: Final answer
    x = 948.80

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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.