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Finding the Fourth Proportional to 2,859.79, 4,290.38 and 911.99

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Solution

The fourth proportional to 2,859.79, 4,290.38 and 911.99 is: 1,368.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,859.79 : 4,290.38 = 911.99 : x
  2. Step 2: Convert to fraction form
    2,859.79/4,290.38 = 911.99/x
  3. Step 3: Cross multiply
    2,859.79x = 4,290.38 × 911.99
  4. Step 4: Simplify right side
    2,859.79x = 3,912,783.66
  5. Step 5: Solve for x
    x = 3,912,783.66/2,859.79
  6. Step 6: Final answer
    x = 1,368.21

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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.