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Finding the Fourth Proportional to 547.70, 821.55 and 418.10

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Solution

The fourth proportional to 547.70, 821.55 and 418.10 is: 627.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.70 : 821.55 = 418.10 : x
  2. Step 2: Convert to fraction form
    547.70/821.55 = 418.10/x
  3. Step 3: Cross multiply
    547.70x = 821.55 × 418.10
  4. Step 4: Simplify right side
    547.70x = 343,490.06
  5. Step 5: Solve for x
    x = 343,490.06/547.70
  6. Step 6: Final answer
    x = 627.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.