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Finding the Fourth Proportional to 3,109.79, 4,664.24 and 918.70

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Solution

The fourth proportional to 3,109.79, 4,664.24 and 918.70 is: 1,377.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.79 : 4,664.24 = 918.70 : x
  2. Step 2: Convert to fraction form
    3,109.79/4,664.24 = 918.70/x
  3. Step 3: Cross multiply
    3,109.79x = 4,664.24 × 918.70
  4. Step 4: Simplify right side
    3,109.79x = 4,285,009.37
  5. Step 5: Solve for x
    x = 4,285,009.37/3,109.79
  6. Step 6: Final answer
    x = 1,377.91

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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.