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Finding the Fourth Proportional to 936.65, 1,405.26 and 320.35

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Solution

The fourth proportional to 936.65, 1,405.26 and 320.35 is: 480.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.65 : 1,405.26 = 320.35 : x
  2. Step 2: Convert to fraction form
    936.65/1,405.26 = 320.35/x
  3. Step 3: Cross multiply
    936.65x = 1,405.26 × 320.35
  4. Step 4: Simplify right side
    936.65x = 450,171.53
  5. Step 5: Solve for x
    x = 450,171.53/936.65
  6. Step 6: Final answer
    x = 480.62

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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.