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Finding the Fourth Proportional to 581.45, 872.21 and 191.49

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Solution

The fourth proportional to 581.45, 872.21 and 191.49 is: 287.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.45 : 872.21 = 191.49 : x
  2. Step 2: Convert to fraction form
    581.45/872.21 = 191.49/x
  3. Step 3: Cross multiply
    581.45x = 872.21 × 191.49
  4. Step 4: Simplify right side
    581.45x = 167,019.49
  5. Step 5: Solve for x
    x = 167,019.49/581.45
  6. Step 6: Final answer
    x = 287.25

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Double scale
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Similar ratio
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1.5x scale

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.