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Finding the Fourth Proportional to 3,109.90, 4,664.89 and 918.66

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Solution

The fourth proportional to 3,109.90, 4,664.89 and 918.66 is: 1,378.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.90 : 4,664.89 = 918.66 : x
  2. Step 2: Convert to fraction form
    3,109.90/4,664.89 = 918.66/x
  3. Step 3: Cross multiply
    3,109.90x = 4,664.89 × 918.66
  4. Step 4: Simplify right side
    3,109.90x = 4,285,447.85
  5. Step 5: Solve for x
    x = 4,285,447.85/3,109.90
  6. Step 6: Final answer
    x = 1,378.00

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1.5x scale

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.