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Finding the Fourth Proportional to 1,913.86, 2,870.44 and 681.31

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Solution

The fourth proportional to 1,913.86, 2,870.44 and 681.31 is: 1,021.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.86 : 2,870.44 = 681.31 : x
  2. Step 2: Convert to fraction form
    1,913.86/2,870.44 = 681.31/x
  3. Step 3: Cross multiply
    1,913.86x = 2,870.44 × 681.31
  4. Step 4: Simplify right side
    1,913.86x = 1,955,661.36
  5. Step 5: Solve for x
    x = 1,955,661.36/1,913.86
  6. Step 6: Final answer
    x = 1,021.84

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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.