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Finding the Fourth Proportional to 949.89, 1,311.02 and 551.81

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Solution

The fourth proportional to 949.89, 1,311.02 and 551.81 is: 761.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.89 : 1,311.02 = 551.81 : x
  2. Step 2: Convert to fraction form
    949.89/1,311.02 = 551.81/x
  3. Step 3: Cross multiply
    949.89x = 1,311.02 × 551.81
  4. Step 4: Simplify right side
    949.89x = 723,433.95
  5. Step 5: Solve for x
    x = 723,433.95/949.89
  6. Step 6: Final answer
    x = 761.60

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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.