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Finding the Fourth Proportional to 936.70, 1,405.91 and 474.80

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Solution

The fourth proportional to 936.70, 1,405.91 and 474.80 is: 712.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.70 : 1,405.91 = 474.80 : x
  2. Step 2: Convert to fraction form
    936.70/1,405.91 = 474.80/x
  3. Step 3: Cross multiply
    936.70x = 1,405.91 × 474.80
  4. Step 4: Simplify right side
    936.70x = 667,526.07
  5. Step 5: Solve for x
    x = 667,526.07/936.70
  6. Step 6: Final answer
    x = 712.64

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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.