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Finding the Fourth Proportional to 643.04, 965.36 and 438.08

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Solution

The fourth proportional to 643.04, 965.36 and 438.08 is: 657.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.04 : 965.36 = 438.08 : x
  2. Step 2: Convert to fraction form
    643.04/965.36 = 438.08/x
  3. Step 3: Cross multiply
    643.04x = 965.36 × 438.08
  4. Step 4: Simplify right side
    643.04x = 422,904.91
  5. Step 5: Solve for x
    x = 422,904.91/643.04
  6. Step 6: Final answer
    x = 657.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.