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Finding the Fourth Proportional to 663.15, 914.75 and 439.08

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Solution

The fourth proportional to 663.15, 914.75 and 439.08 is: 605.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.15 : 914.75 = 439.08 : x
  2. Step 2: Convert to fraction form
    663.15/914.75 = 439.08/x
  3. Step 3: Cross multiply
    663.15x = 914.75 × 439.08
  4. Step 4: Simplify right side
    663.15x = 401,646.23
  5. Step 5: Solve for x
    x = 401,646.23/663.15
  6. Step 6: Final answer
    x = 605.66

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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.