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Finding the Fourth Proportional to 2,913.81, 4,369.69 and 939.36

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Solution

The fourth proportional to 2,913.81, 4,369.69 and 939.36 is: 1,408.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,913.81 : 4,369.69 = 939.36 : x
  2. Step 2: Convert to fraction form
    2,913.81/4,369.69 = 939.36/x
  3. Step 3: Cross multiply
    2,913.81x = 4,369.69 × 939.36
  4. Step 4: Simplify right side
    2,913.81x = 4,104,714.63
  5. Step 5: Solve for x
    x = 4,104,714.63/2,913.81
  6. Step 6: Final answer
    x = 1,408.71

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1.5x scale

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.