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Finding the Fourth Proportional to 547.18, 820.72 and 315.93

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Solution

The fourth proportional to 547.18, 820.72 and 315.93 is: 473.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.18 : 820.72 = 315.93 : x
  2. Step 2: Convert to fraction form
    547.18/820.72 = 315.93/x
  3. Step 3: Cross multiply
    547.18x = 820.72 × 315.93
  4. Step 4: Simplify right side
    547.18x = 259,290.07
  5. Step 5: Solve for x
    x = 259,290.07/547.18
  6. Step 6: Final answer
    x = 473.87

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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.