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Finding the Fourth Proportional to 949.91, 1,311.19 and 551.63

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Solution

The fourth proportional to 949.91, 1,311.19 and 551.63 is: 761.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.91 : 1,311.19 = 551.63 : x
  2. Step 2: Convert to fraction form
    949.91/1,311.19 = 551.63/x
  3. Step 3: Cross multiply
    949.91x = 1,311.19 × 551.63
  4. Step 4: Simplify right side
    949.91x = 723,293.64
  5. Step 5: Solve for x
    x = 723,293.64/949.91
  6. Step 6: Final answer
    x = 761.44

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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.