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Finding the Fourth Proportional to 1,809.46, 2,714.31 and 639.32

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Solution

The fourth proportional to 1,809.46, 2,714.31 and 639.32 is: 959.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,809.46 : 2,714.31 = 639.32 : x
  2. Step 2: Convert to fraction form
    1,809.46/2,714.31 = 639.32/x
  3. Step 3: Cross multiply
    1,809.46x = 2,714.31 × 639.32
  4. Step 4: Simplify right side
    1,809.46x = 1,735,312.67
  5. Step 5: Solve for x
    x = 1,735,312.67/1,809.46
  6. Step 6: Final answer
    x = 959.02

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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.