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Finding the Fourth Proportional to 547.09, 820.65 and 157.12

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Solution

The fourth proportional to 547.09, 820.65 and 157.12 is: 235.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.09 : 820.65 = 157.12 : x
  2. Step 2: Convert to fraction form
    547.09/820.65 = 157.12/x
  3. Step 3: Cross multiply
    547.09x = 820.65 × 157.12
  4. Step 4: Simplify right side
    547.09x = 128,940.53
  5. Step 5: Solve for x
    x = 128,940.53/547.09
  6. Step 6: Final answer
    x = 235.68

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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.