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Finding the Fourth Proportional to 2,905.07, 4,009.01 and 1,578.78

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Solution

The fourth proportional to 2,905.07, 4,009.01 and 1,578.78 is: 2,178.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,905.07 : 4,009.01 = 1,578.78 : x
  2. Step 2: Convert to fraction form
    2,905.07/4,009.01 = 1,578.78/x
  3. Step 3: Cross multiply
    2,905.07x = 4,009.01 × 1,578.78
  4. Step 4: Simplify right side
    2,905.07x = 6,329,336.91
  5. Step 5: Solve for x
    x = 6,329,336.91/2,905.07
  6. Step 6: Final answer
    x = 2,178.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.