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Finding the Fourth Proportional to 461.65, 636.79 and 402.78

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Solution

The fourth proportional to 461.65, 636.79 and 402.78 is: 555.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.65 : 636.79 = 402.78 : x
  2. Step 2: Convert to fraction form
    461.65/636.79 = 402.78/x
  3. Step 3: Cross multiply
    461.65x = 636.79 × 402.78
  4. Step 4: Simplify right side
    461.65x = 256,486.28
  5. Step 5: Solve for x
    x = 256,486.28/461.65
  6. Step 6: Final answer
    x = 555.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.