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Finding the Fourth Proportional to 547.18, 820.09 and 315.61

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Solution

The fourth proportional to 547.18, 820.09 and 315.61 is: 473.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.18 : 820.09 = 315.61 : x
  2. Step 2: Convert to fraction form
    547.18/820.09 = 315.61/x
  3. Step 3: Cross multiply
    547.18x = 820.09 × 315.61
  4. Step 4: Simplify right side
    547.18x = 258,828.60
  5. Step 5: Solve for x
    x = 258,828.60/547.18
  6. Step 6: Final answer
    x = 473.02

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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.