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Finding the Fourth Proportional to 1,809.65, 2,714.78 and 639.61

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Solution

The fourth proportional to 1,809.65, 2,714.78 and 639.61 is: 959.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,809.65 : 2,714.78 = 639.61 : x
  2. Step 2: Convert to fraction form
    1,809.65/2,714.78 = 639.61/x
  3. Step 3: Cross multiply
    1,809.65x = 2,714.78 × 639.61
  4. Step 4: Simplify right side
    1,809.65x = 1,736,400.44
  5. Step 5: Solve for x
    x = 1,736,400.44/1,809.65
  6. Step 6: Final answer
    x = 959.52

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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.