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Finding the Fourth Proportional to 936.68, 1,404.61 and 720.41

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Solution

The fourth proportional to 936.68, 1,404.61 and 720.41 is: 1,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.68 : 1,404.61 = 720.41 : x
  2. Step 2: Convert to fraction form
    936.68/1,404.61 = 720.41/x
  3. Step 3: Cross multiply
    936.68x = 1,404.61 × 720.41
  4. Step 4: Simplify right side
    936.68x = 1,011,886.27
  5. Step 5: Solve for x
    x = 1,011,886.27/936.68
  6. Step 6: Final answer
    x = 1,080.30

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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.