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Finding the Fourth Proportional to 1,914, 2,870.82 and 681.36

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Solution

The fourth proportional to 1,914, 2,870.82 and 681.36 is: 1,021.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,914 : 2,870.82 = 681.36 : x
  2. Step 2: Convert to fraction form
    1,914/2,870.82 = 681.36/x
  3. Step 3: Cross multiply
    1,914x = 2,870.82 × 681.36
  4. Step 4: Simplify right side
    1,914x = 1,956,061.92
  5. Step 5: Solve for x
    x = 1,956,061.92/1,914
  6. Step 6: Final answer
    x = 1,021.98

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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.