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Finding the Fourth Proportional to 476, 656.74 and 310.36

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Solution

The fourth proportional to 476, 656.74 and 310.36 is: 428.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    476 : 656.74 = 310.36 : x
  2. Step 2: Convert to fraction form
    476/656.74 = 310.36/x
  3. Step 3: Cross multiply
    476x = 656.74 × 310.36
  4. Step 4: Simplify right side
    476x = 203,825.83
  5. Step 5: Solve for x
    x = 203,825.83/476
  6. Step 6: Final answer
    x = 428.21

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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.