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Finding the Fourth Proportional to 591.45, 891.61 and 551.81

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Solution

The fourth proportional to 591.45, 891.61 and 551.81 is: 831.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.45 : 891.61 = 551.81 : x
  2. Step 2: Convert to fraction form
    591.45/891.61 = 551.81/x
  3. Step 3: Cross multiply
    591.45x = 891.61 × 551.81
  4. Step 4: Simplify right side
    591.45x = 491,993.48
  5. Step 5: Solve for x
    x = 491,993.48/591.45
  6. Step 6: Final answer
    x = 831.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.