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Finding the Fourth Proportional to 476.25, 656.42 and 393.09

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Solution

The fourth proportional to 476.25, 656.42 and 393.09 is: 541.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.25 : 656.42 = 393.09 : x
  2. Step 2: Convert to fraction form
    476.25/656.42 = 393.09/x
  3. Step 3: Cross multiply
    476.25x = 656.42 × 393.09
  4. Step 4: Simplify right side
    476.25x = 258,030.17
  5. Step 5: Solve for x
    x = 258,030.17/476.25
  6. Step 6: Final answer
    x = 541.80

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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.