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Finding the Fourth Proportional to 804.65, 1,207.07 and 256.71

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Solution

The fourth proportional to 804.65, 1,207.07 and 256.71 is: 385.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.65 : 1,207.07 = 256.71 : x
  2. Step 2: Convert to fraction form
    804.65/1,207.07 = 256.71/x
  3. Step 3: Cross multiply
    804.65x = 1,207.07 × 256.71
  4. Step 4: Simplify right side
    804.65x = 309,861.13
  5. Step 5: Solve for x
    x = 309,861.13/804.65
  6. Step 6: Final answer
    x = 385.09

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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.