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Finding the Fourth Proportional to 581.41, 872.12 and 256.71

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Solution

The fourth proportional to 581.41, 872.12 and 256.71 is: 385.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.41 : 872.12 = 256.71 : x
  2. Step 2: Convert to fraction form
    581.41/872.12 = 256.71/x
  3. Step 3: Cross multiply
    581.41x = 872.12 × 256.71
  4. Step 4: Simplify right side
    581.41x = 223,880.64
  5. Step 5: Solve for x
    x = 223,880.64/581.41
  6. Step 6: Final answer
    x = 385.07

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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.