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Finding the Fourth Proportional to 2,907.31, 4,011.42 and 1,964.86

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Solution

The fourth proportional to 2,907.31, 4,011.42 and 1,964.86 is: 2,711.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,907.31 : 4,011.42 = 1,964.86 : x
  2. Step 2: Convert to fraction form
    2,907.31/4,011.42 = 1,964.86/x
  3. Step 3: Cross multiply
    2,907.31x = 4,011.42 × 1,964.86
  4. Step 4: Simplify right side
    2,907.31x = 7,881,878.70
  5. Step 5: Solve for x
    x = 7,881,878.70/2,907.31
  6. Step 6: Final answer
    x = 2,711.06

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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.