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Finding the Fourth Proportional to 581.47, 872.21 and 191.48

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Solution

The fourth proportional to 581.47, 872.21 and 191.48 is: 287.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.47 : 872.21 = 191.48 : x
  2. Step 2: Convert to fraction form
    581.47/872.21 = 191.48/x
  3. Step 3: Cross multiply
    581.47x = 872.21 × 191.48
  4. Step 4: Simplify right side
    581.47x = 167,006.89
  5. Step 5: Solve for x
    x = 167,006.89/581.47
  6. Step 6: Final answer
    x = 287.22

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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.