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Finding the Fourth Proportional to 591.17, 891.18 and 551.53

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Solution

The fourth proportional to 591.17, 891.18 and 551.53 is: 831.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.17 : 891.18 = 551.53 : x
  2. Step 2: Convert to fraction form
    591.17/891.18 = 551.53/x
  3. Step 3: Cross multiply
    591.17x = 891.18 × 551.53
  4. Step 4: Simplify right side
    591.17x = 491,508.05
  5. Step 5: Solve for x
    x = 491,508.05/591.17
  6. Step 6: Final answer
    x = 831.42

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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.