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Finding the Fourth Proportional to 547.86, 821.79 and 425.78

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Solution

The fourth proportional to 547.86, 821.79 and 425.78 is: 638.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.86 : 821.79 = 425.78 : x
  2. Step 2: Convert to fraction form
    547.86/821.79 = 425.78/x
  3. Step 3: Cross multiply
    547.86x = 821.79 × 425.78
  4. Step 4: Simplify right side
    547.86x = 349,897.64
  5. Step 5: Solve for x
    x = 349,897.64/547.86
  6. Step 6: Final answer
    x = 638.66

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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.