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Finding the Fourth Proportional to 582.20, 872.63 and 256.90

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Solution

The fourth proportional to 582.20, 872.63 and 256.90 is: 385.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    582.20 : 872.63 = 256.90 : x
  2. Step 2: Convert to fraction form
    582.20/872.63 = 256.90/x
  3. Step 3: Cross multiply
    582.20x = 872.63 × 256.90
  4. Step 4: Simplify right side
    582.20x = 224,178.65
  5. Step 5: Solve for x
    x = 224,178.65/582.20
  6. Step 6: Final answer
    x = 385.05

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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.