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Finding the Fourth Proportional to 661.35, 913.43 and 439.92

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Solution

The fourth proportional to 661.35, 913.43 and 439.92 is: 607.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.35 : 913.43 = 439.92 : x
  2. Step 2: Convert to fraction form
    661.35/913.43 = 439.92/x
  3. Step 3: Cross multiply
    661.35x = 913.43 × 439.92
  4. Step 4: Simplify right side
    661.35x = 401,837.23
  5. Step 5: Solve for x
    x = 401,837.23/661.35
  6. Step 6: Final answer
    x = 607.60

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