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Finding the Fourth Proportional to 578.99, 863.47 and 551.45

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Solution

The fourth proportional to 578.99, 863.47 and 551.45 is: 822.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.99 : 863.47 = 551.45 : x
  2. Step 2: Convert to fraction form
    578.99/863.47 = 551.45/x
  3. Step 3: Cross multiply
    578.99x = 863.47 × 551.45
  4. Step 4: Simplify right side
    578.99x = 476,160.53
  5. Step 5: Solve for x
    x = 476,160.53/578.99
  6. Step 6: Final answer
    x = 822.40

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.