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Finding the Fourth Proportional to 681.18, 939.75 and 474.30

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Solution

The fourth proportional to 681.18, 939.75 and 474.30 is: 654.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.18 : 939.75 = 474.30 : x
  2. Step 2: Convert to fraction form
    681.18/939.75 = 474.30/x
  3. Step 3: Cross multiply
    681.18x = 939.75 × 474.30
  4. Step 4: Simplify right side
    681.18x = 445,723.43
  5. Step 5: Solve for x
    x = 445,723.43/681.18
  6. Step 6: Final answer
    x = 654.34

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1.5x scale

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.