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Finding the Fourth Proportional to 2,859.76, 4,290.05 and 911.31

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Solution

The fourth proportional to 2,859.76, 4,290.05 and 911.31 is: 1,367.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,859.76 : 4,290.05 = 911.31 : x
  2. Step 2: Convert to fraction form
    2,859.76/4,290.05 = 911.31/x
  3. Step 3: Cross multiply
    2,859.76x = 4,290.05 × 911.31
  4. Step 4: Simplify right side
    2,859.76x = 3,909,565.47
  5. Step 5: Solve for x
    x = 3,909,565.47/2,859.76
  6. Step 6: Final answer
    x = 1,367.10

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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.